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Field Descriptions
73 matching records found.
Label Query: Genus = "Ceratophyllum", Species = "demersum"
Ceratophyllaceae
1. Ceratophyllum demersum L.
U.S.A., Washington, Grant County:
Rainbow Lake, between Park Lake and Perch Lake, Dry Falls St. Park.
47.60472°, -119.34639°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
A small man-made lake. Phenology: Vegetative. Origin: Native.
WTU 173729
Xerpha M. Gaines 723    6 Jun 1952
with Dorothy Naas, T. H. Scheffer
1. Ceratophyllum demersum L.
Database ID
7403 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
173729 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
3. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsma, 1994.  
Type Notes
 
Collector
Xerpha M. Gaines 
Collection #
723 
Other Collectors
Dorothy Naas, T. H. Scheffer 
Date Collected
6 Jun 1952 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Grant 
Locality
Rainbow Lake, between Park Lake and Perch Lake, Dry Falls St. Park. 
Elevation
 
Coordinates
47.60472°, -119.34639° 
Site Description
A small man-made lake. 
Specimen Notes
 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
2. Ceratophyllum demersum L.
U.S.A., Washington, Klickitat County:
White Salmon (now Bingen).
45.715°, -121.46333°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Phenology: Vegetative. Origin: Native.
WTU 263057
Wilhelm N. Suksdorf 13776     Nov 1879
2. Ceratophyllum demersum L.
Database ID
7404 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
263057 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
3. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsma, 1994.  
Type Notes
 
Collector
Wilhelm N. Suksdorf 
Collection #
13776 
Other Collectors
 
Date Collected
Nov 1879 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Klickitat 
Locality
White Salmon (now Bingen). 
Elevation
 
Coordinates
45.715°, -121.46333° 
Site Description
 
Specimen Notes
 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
3. Ceratophyllum demersum L.
U.S.A., Washington, King County:
North end of Lake Washington.
47.75366°, -122.26139°. Datum: WGS 84. Coordinate uncertainty: 2000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Phenology: Vegetative. Origin: Native.
WTU 51923
I. C. Otis 2124    26 Jul 1936
3. Ceratophyllum demersum L.
Database ID
7405 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
51923 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
4. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsma, 1994.  
Type Notes
 
Collector
I. C. Otis 
Collection #
2124 
Other Collectors
 
Date Collected
26 Jul 1936 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
North end of Lake Washington. 
Elevation
 
Coordinates
47.75366°, -122.26139° 
Site Description
 
Specimen Notes
 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
4. Ceratophyllum demersum L.
U.S.A., Washington, Pend Oreille County:
Tiger Slough.
Elev. 2000 ft. T36N R43E S4. Datum: NAD 27. Coordinate uncertainty: 805 meters. Georeferenced by Ben Legler. Coordinate Source: TRS2LL.
In slow moving water and sloughs. Phenology: Vegetative. Origin: Native.
WTU 242428
Earle F. Layser 1140    13 Aug 1969
4. Ceratophyllum demersum L.
Database ID
7406 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
242428 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
3. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsma, 1994.  
Type Notes
 
Collector
Earle F. Layser 
Collection #
1140 
Other Collectors
 
Date Collected
13 Aug 1969 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Pend Oreille 
Locality
Tiger Slough. 
Elevation
2000 ft. 
Coordinates
T36N R43E S4 
Site Description
 
Specimen Notes
In slow moving water and sloughs. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
5. Ceratophyllum demersum L.
U.S.A., Washington, Stevens County:
Cedar Lake, 4 miles S of Boundary.
48.924895°, -117.63667°. Datum: WGS 84. Coordinate uncertainty: 1000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Phenology: Vegetative. Origin: Native.
WTU 132703
C. F. Yocum s.n.    14 Aug 1947
5. Ceratophyllum demersum L.
Database ID
7407 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
132703 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
4. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsm, 1994.  
Type Notes
 
Collector
C. F. Yocum 
Collection #
s.n. 
Other Collectors
 
Date Collected
14 Aug 1947 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Stevens 
Locality
Cedar Lake, 4 miles S of Boundary. 
Elevation
 
Coordinates
48.924895°, -117.63667° 
Site Description
 
Specimen Notes
 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
6. Ceratophyllum demersum L.
U.S.A., Washington, San Juan County:
San Juan Island, Sportsmans Lake, ca 3 mi NW of Friday Harbor NE side of lake, at public access.
48.565971°, -123.051644°. Datum: WGS 84. Coordinate uncertainty: 500 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Free-floating to weakly-anchored aquatic of shallow muddy bottom; abundant perennials. Phenology: Vegetative. Origin: Native.
WTU 314082
Scott R. Atkinson 209    16 Jun 1986
6. Ceratophyllum demersum L.
Database ID
7408 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
314082 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
2. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsma, 1994.  
Type Notes
 
Collector
Scott R. Atkinson 
Collection #
209 
Other Collectors
 
Date Collected
16 Jun 1986 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
San Juan 
Locality
San Juan Island, Sportsmans Lake, ca 3 mi NW of Friday Harbor NE side of lake, at public access. 
Elevation
 
Coordinates
48.565971°, -123.051644° 
Site Description
 
Specimen Notes
Free-floating to weakly-anchored aquatic of shallow muddy bottom; abundant perennials. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
7. Ceratophyllum demersum L.
U.S.A., Washington, Skagit County:
Lake Erie.
48.45279°, -122.6407°. Datum: WGS 84. Coordinate uncertainty: 1000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
In shallow water. Phenology: Vegetative. Origin: Native.
WTU 292150
Walter J. Eyerdam 1310    21 Aug 1937
7. Ceratophyllum demersum L.
Database ID
7409 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
292150 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
2. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsma, 1994.  
Type Notes
 
Collector
Walter J. Eyerdam 
Collection #
1310 
Other Collectors
 
Date Collected
21 Aug 1937 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Skagit 
Locality
Lake Erie. 
Elevation
 
Coordinates
48.45279°, -122.6407° 
Site Description
In shallow water. 
Specimen Notes
 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
8. Ceratophyllum demersum L.
U.S.A., Washington, Whatcom County:
Barrett Lake, Ferndale.
48.85139°, -122.56972°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
In sluggish water. Phenology: Vegetative. Origin: Native.
WTU 56033
W. C. Muenscher 10167    7 Jul 1939
8. Ceratophyllum demersum L.
Database ID
7410 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
56033 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
3. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsma, 1994.  
Type Notes
 
Collector
W. C. Muenscher 
Collection #
10167 
Other Collectors
 
Date Collected
7 Jul 1939 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Whatcom 
Locality
Barrett Lake, Ferndale. 
Elevation
 
Coordinates
48.85139°, -122.56972° 
Site Description
In sluggish water. 
Specimen Notes
 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
9. Ceratophyllum demersum L.
U.S.A., Washington, Whitman County:
Toolie Lake, 3 miles northwest of Ewan.
47.147639°, -117.779015°. Datum: WGS 84. Coordinate uncertainty: 1000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Submerged in lake. Phenology: Vegetative. Origin: Native.
WTU 66114
F. L. Pickett 1605    7 Jun 1934
with J. F. G. Clarke, L. A. Dillon
9. Ceratophyllum demersum L.
Database ID
7411 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
66114 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
4. Ceratophyllum demersum L.
    Annotated by John A. Christy and Mark D. Sylsma, 1994.  
Type Notes
 
Collector
F. L. Pickett 
Collection #
1605 
Other Collectors
J. F. G. Clarke, L. A. Dillon 
Date Collected
7 Jun 1934 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Whitman 
Locality
Toolie Lake, 3 miles northwest of Ewan. 
Elevation
 
Coordinates
47.147639°, -117.779015° 
Site Description
 
Specimen Notes
Submerged in lake. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
10. Ceratophyllum demersum L.
Russian Federation, Sakhalin Region
Sakhalin Island, central part; circa 10 kilometers north-northwest of Tymovskoye and 4 kilometers northwest of Voskressnovka, on west bank of Tym River.
Elev. 328 ft. 50° 53' 30" N, 142° 38' 45" E.
Mix of hay fields, Salix and Alnus stands, and water-filled ditches. Growing in shallow water in ditch; no fertile material found. Phenology: Vegetative. Origin: Native.
WTU 357311
Ben Legler 1022    30 Jul 2003
10. Ceratophyllum demersum L.
Database ID
28093 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
357311 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Slava Barkalov, 2003.  
Type Notes
 
Collector
Ben Legler 
Collection #
1022 
Other Collectors
 
Date Collected
30 Jul 2003 
Verbatim Date
 
Country
Russian Federation 
State or Province
Sakhalin Region 
County
 
Locality
Sakhalin Island, central part; circa 10 kilometers north-northwest of Tymovskoye and 4 kilometers northwest of Voskressnovka, on west bank of Tym River. 
Elevation
328 ft. 
Coordinates
50° 53' 30" N, 142° 38' 45" E 
Site Description
Mix of hay fields, Salix and Alnus stands, and water-filled ditches. 
Specimen Notes
Growing in shallow water in ditch; no fertile material found. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
11. Ceratophyllum demersum L.
U.S.A., Oregon, Malheur County:
Along U.S. Highway 20, ca. 15 miles northeast of Juntura. Malheur River.
Elev. 2728 ft. 43° 47' 14" N, 117° 50' 47" W.
In shallow embayment of the river. Associated Genera: Potamogeton, Elodea canadensis, Carex, Scirpus. Aquatic. Phenology: Fertile. Origin: Native.
WTU 355806
Richard R. Halse 6448    10 Aug 2003
11. Ceratophyllum demersum L.
Database ID
68276 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
355806 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Richard R. Halse 
Collection #
6448 
Other Collectors
 
Date Collected
10 Aug 2003 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Malheur 
Locality
Along U.S. Highway 20, ca. 15 miles northeast of Juntura. Malheur River. 
Elevation
2728 ft. 
Coordinates
43° 47' 14" N, 117° 50' 47" W 
Site Description
In shallow embayment of the river. Associated Genera: Potamogeton, Elodea canadensis, Carex, Scirpus. 
Specimen Notes
Aquatic. 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
12. Ceratophyllum demersum L.
U.S.A., Washington, Whitman County:
Toolie Lake, 3 miles northwest of Ewan.
47.147639°, -117.779015°. Datum: WGS 84. Coordinate uncertainty: 1000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
In water. Submerged. Phenology: Fertile. Origin: Native.
WTU 66114
F. L. Pickett 1605    7 Jun 1934
with J. F. G. Clarke, L. A. Dillon
12. Ceratophyllum demersum L.
Database ID
68277 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
66114 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Myriophyllum verticillatum L.
2. Ceratophyllum demersum L.
3. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
4. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
F. L. Pickett 
Collection #
1605 
Other Collectors
J. F. G. Clarke, L. A. Dillon 
Date Collected
7 Jun 1934 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Whitman 
Locality
Toolie Lake, 3 miles northwest of Ewan. 
Elevation
 
Coordinates
47.147639°, -117.779015° 
Site Description
In water. 
Specimen Notes
Submerged. 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
13. Ceratophyllum demersum L.
U.S.A., Washington, Grant County:
Northrup Lake (Grand Coulee).
47.94167°, -119.00222°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Phenology: Fertile. Origin: Native.
WTU 131164
T. H. Scheffer s.n.    5 Jun 1946
13. Ceratophyllum demersum L.
Database ID
68281 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
131164 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
T. H. Scheffer 
Collection #
s.n. 
Other Collectors
 
Date Collected
5 Jun 1946 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Grant 
Locality
Northrup Lake (Grand Coulee). 
Elevation
 
Coordinates
47.94167°, -119.00222° 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
14. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Seattle.
47.613617°, -122.310098°. Datum: WGS 84. Coordinate uncertainty: 15750 meters. Georeferenced by Joseph Stormer. Coordinate Source: Digital Map.
Phenology: Fertile. Origin: Native.
WTU 8080
C. V. Piper 765    15 Jun 1889
14. Ceratophyllum demersum L.
Database ID
68283 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
8080 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.  
Type Notes
 
Collector
C. V. Piper 
Collection #
765 
Other Collectors
 
Date Collected
15 Jun 1889 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Seattle. 
Elevation
 
Coordinates
47.613617°, -122.310098° 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
15. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Lake Washington.
47.62451°, -122.25583°. Datum: WGS 84. Coordinate uncertainty: 14500 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Shallow water. Floating. Phenology: Fertile. Origin: Native.
WTU 7982
Lucile W. Sutyre s.n.    1 Oct 1904
15. Ceratophyllum demersum L.
Database ID
68284 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
7982 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
Lucile W. Sutyre 
Collection #
s.n. 
Other Collectors
 
Date Collected
1 Oct 1904 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Lake Washington. 
Elevation
 
Coordinates
47.62451°, -122.25583° 
Site Description
Shallow water. 
Specimen Notes
Floating. 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
16. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Seattle.
47.613617°, -122.310098°. Datum: WGS 84. Coordinate uncertainty: 15750 meters. Georeferenced by Joseph Stormer. Coordinate Source: Digital Map.
In shallow water. Phenology: Fertile. Origin: Native.
WTU 8125
C. G. Riedel s.n.    3 Oct 1905
16. Ceratophyllum demersum L.
Database ID
68287 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
8125 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
C. G. Riedel 
Collection #
s.n. 
Other Collectors
 
Date Collected
3 Oct 1905 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Seattle. 
Elevation
 
Coordinates
47.613617°, -122.310098° 
Site Description
In shallow water. 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
17. Ceratophyllum demersum L.
U.S.A., Washington, King County:
In Lake Washington, University of Washington Campus, Seattle.
47.60639°, -122.33083°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Phenology: Fertile. Origin: Native.
WTU 7883
T. C. Frye s.n.    15 Mar 1904
17. Ceratophyllum demersum L.
Database ID
68288 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
7883 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
T. C. Frye 
Collection #
s.n. 
Other Collectors
 
Date Collected
15 Mar 1904 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
In Lake Washington, University of Washington Campus, Seattle. 
Elevation
 
Coordinates
47.60639°, -122.33083° 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
18. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Lake Washington, Seattle.
47.60639°, -122.33083°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Floating in still water. Roots in soft lake bottom. Phenology: Fertile. Origin: Native.
WTU 7878
S. J. Anthon s.n.    13 Nov 1905
18. Ceratophyllum demersum L.
Database ID
68291 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
7878 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by S. J. Anthon.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
S. J. Anthon 
Collection #
s.n. 
Other Collectors
 
Date Collected
13 Nov 1905 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Lake Washington, Seattle. 
Elevation
 
Coordinates
47.60639°, -122.33083° 
Site Description
Floating in still water. 
Specimen Notes
Roots in soft lake bottom. 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
19. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Lake Washington, University of Washington Campus, Seattle.
47.60639°, -122.33083°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Submerged in shallow water. Phenology: Fertile. Origin: Native.
WTU 7881
T. C. Frye s.n.    1 Oct 1907
19. Ceratophyllum demersum L.
Database ID
68295 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
7881 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by T. C. Frye.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
T. C. Frye 
Collection #
s.n. 
Other Collectors
 
Date Collected
1 Oct 1907 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Lake Washington, University of Washington Campus, Seattle. 
Elevation
 
Coordinates
47.60639°, -122.33083° 
Site Description
Submerged in shallow water. 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
20. Ceratophyllum demersum L.
U.S.A., Washington, King County:
In Lake Washington, Seattle.
47.60639°, -122.33083°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Phenology: Fertile. Origin: Native.
WTU 7999
M. Madison s.n.    26 Sep 1908
20. Ceratophyllum demersum L.
Database ID
68297 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
7999 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by T. C. Frye.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
M. Madison 
Collection #
s.n. 
Other Collectors
 
Date Collected
26 Sep 1908 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
In Lake Washington, Seattle. 
Elevation
 
Coordinates
47.60639°, -122.33083° 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
21. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Lake Washington, University of Washington Campus, Seattle.
47.60639°, -122.33083°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
In water. Phenology: Fertile. Origin: Native.
WTU 8021
H. Harding s.n.    6 Oct 1908
21. Ceratophyllum demersum L.
Database ID
68301 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
8021 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by T. C. Frye.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
H. Harding 
Collection #
s.n. 
Other Collectors
 
Date Collected
6 Oct 1908 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Lake Washington, University of Washington Campus, Seattle. 
Elevation
 
Coordinates
47.60639°, -122.33083° 
Site Description
In water. 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
22. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Seattle.
47.613617°, -122.310098°. Datum: WGS 84. Coordinate uncertainty: 15750 meters. Georeferenced by Joseph Stormer. Coordinate Source: Digital Map.
In water. Phenology: Fertile. Origin: Native.
WTU 8150
B. N. Phillips s.n.    22 Oct 1910
22. Ceratophyllum demersum L.
Database ID
68303 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
8150 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by T. C. Frye.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
B. N. Phillips 
Collection #
s.n. 
Other Collectors
 
Date Collected
22 Oct 1910 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Seattle. 
Elevation
 
Coordinates
47.613617°, -122.310098° 
Site Description
In water. 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
23. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Seattle.
47.613617°, -122.310098°. Datum: WGS 84. Coordinate uncertainty: 15750 meters. Georeferenced by Joseph Stormer. Coordinate Source: Digital Map.
Phenology: Fertile. Origin: Native.
WTU 7873
M. Bolger 74    5 Nov 1910
23. Ceratophyllum demersum L.
Database ID
68304 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
7873 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by T. C. Frye.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
M. Bolger 
Collection #
74 
Other Collectors
 
Date Collected
5 Nov 1910 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Seattle. 
Elevation
 
Coordinates
47.613617°, -122.310098° 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
24. Ceratophyllum demersum L.
U.S.A., Washington, King County:
In Lake Washington, Mercer Island.
47.57083°, -122.22083°. Datum: WGS 84. Coordinate uncertainty: 10000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Shallow water. Submerged. Phenology: Fertile. Origin: Native.
WTU 25396JWT
J. William Thompson 7593    24 Jul 1931
24. Ceratophyllum demersum L.
Database ID
68306 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
25396JWT 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Myriophyllum verticillatum L.
2. Ceratophyllum demersum L.
3. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
4. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
J. William Thompson 
Collection #
7593 
Other Collectors
 
Date Collected
24 Jul 1931 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
In Lake Washington, Mercer Island. 
Elevation
 
Coordinates
47.57083°, -122.22083° 
Site Description
Shallow water. 
Specimen Notes
Submerged. 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
25. Ceratophyllum demersum L.
U.S.A., Montana, Lake County:
Large "pot hole" 0.2 miles southeast of Nine-Pipes Reservoir.
Phenology: Fertile. Origin: Native.
WTU 224386
C. L. Hitchcock 23983    11 Jul 1965
25. Ceratophyllum demersum L.
Database ID
68310 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
224386 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
C. L. Hitchcock 
Collection #
23983 
Other Collectors
 
Date Collected
11 Jul 1965 
Verbatim Date
 
Country
U.S.A. 
State or Province
Montana 
County
Lake 
Locality
Large "pot hole" 0.2 miles southeast of Nine-Pipes Reservoir. 
Elevation
 
Coordinates
 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
26. Ceratophyllum demersum L.
U.S.A., Wisconsin
Little John Lake, Boulder Junction.
Phenology: Fertile.
WTU 325903
unknown 2380    5 Aug 1958
26. Ceratophyllum demersum L.
Database ID
68312 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
325903 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Najas flexilis (Willd.) Rost. & Schmidt.
2. Ceratophyllum demersum L.
    Annotated by Steven Clemants, 1996.  
Type Notes
 
Collector
unknown 
Collection #
2380 
Other Collectors
 
Date Collected
5 Aug 1958 
Verbatim Date
 
Country
U.S.A. 
State or Province
Wisconsin 
County
 
Locality
Little John Lake, Boulder Junction. 
Elevation
 
Coordinates
 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
27. Ceratophyllum demersum L.
U.S.A., Idaho, Power County:
Backwaters of the Snake River along US 30, 12 miles west of American Falls, near Massacre Rock.
Elev. 4200 ft. 42.785866°, -113.090487°. Datum: WGS 84. Coordinate uncertainty: 1000 meters. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Phenology: Fertile. Origin: Native.
WTU 155657
C. L. Porter 6644    2 Sep 1954
27. Ceratophyllum demersum L.
Database ID
68314 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
155657 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by C.L.P..
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
C. L. Porter 
Collection #
6644 
Other Collectors
 
Date Collected
2 Sep 1954 
Verbatim Date
 
Country
U.S.A. 
State or Province
Idaho 
County
Power 
Locality
Backwaters of the Snake River along US 30, 12 miles west of American Falls, near Massacre Rock. 
Elevation
4200 ft. 
Coordinates
42.785866°, -113.090487° 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
28. Ceratophyllum demersum L.
Canada, British Columbia
100 mile House.
Submerged. Phenology: Fertile.
WTU 144104
J. Hatter 193    18 Jul 1949
28. Ceratophyllum demersum L.
Database ID
68317 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
144104 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
J. Hatter 
Collection #
193 
Other Collectors
 
Date Collected
18 Jul 1949 
Verbatim Date
 
Country
Canada 
State or Province
British Columbia 
County
 
Locality
100 mile House. 
Elevation
 
Coordinates
 
Site Description
 
Specimen Notes
Submerged. 
Phenology
Fertile 
Origin
 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
29. Ceratophyllum demersum L.
U.S.A., Oregon, Klamath County:
5 miles south of Fort Klamath.
In ditch. Phenology: Fertile. Origin: Native.
WTU 25397JWT
J. William Thompson 379    13 Aug 1925
29. Ceratophyllum demersum L.
Database ID
68321 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
25397JWT 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Myriophyllum verticillatum L.
2. Ceratophyllum demersum L.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
J. William Thompson 
Collection #
379 
Other Collectors
 
Date Collected
13 Aug 1925 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Klamath 
Locality
5 miles south of Fort Klamath. 
Elevation
 
Coordinates
 
Site Description
In ditch. 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
30. Ceratophyllum demersum L.
Canada, British Columbia
Near south end of Nimpo Lake.
52° 20' N, 125° 7' W.
In shallwo, muchky-bottomed stream running through meadow. Common. Phenology: Fertile.
WTU 172914
J. A. Parmelee 20449    26 Aug 1956
with J. A. Calder, R. L. Taylor
30. Ceratophyllum demersum L.
Database ID
68323 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
172914 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
J. A. Parmelee 
Collection #
20449 
Other Collectors
J. A. Calder, R. L. Taylor 
Date Collected
26 Aug 1956 
Verbatim Date
 
Country
Canada 
State or Province
British Columbia 
County
 
Locality
Near south end of Nimpo Lake. 
Elevation
 
Coordinates
52° 20' N, 125° 7' W 
Site Description
In shallwo, muchky-bottomed stream running through meadow. 
Specimen Notes
Common. 
Phenology
Fertile 
Origin
 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
31. Ceratophyllum demersum L.
Canada, British Columbia
West end of Eaglet Lake at Giscome; east of Prince George.
Phenology: Fertile.
WTU 172991
J. A. Calder 14401    12 Aug 1954
with D. B. O. Savile, J. M. Ferguson
31. Ceratophyllum demersum L.
Database ID
68327 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
172991 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.  
Type Notes
 
Collector
J. A. Calder 
Collection #
14401 
Other Collectors
D. B. O. Savile, J. M. Ferguson 
Date Collected
12 Aug 1954 
Verbatim Date
 
Country
Canada 
State or Province
British Columbia 
County
 
Locality
West end of Eaglet Lake at Giscome; east of Prince George. 
Elevation
 
Coordinates
 
Site Description
 
Specimen Notes
 
Phenology
Fertile 
Origin
 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
32. Ceratophyllum demersum L.
U.S.A., Montana, Lake County:
3.5 miles south of Ronan.
Elev. 3000 ft. T20N R20W.
In small pothole alongside road. Abundant, pink sepals. Phenology: Fertile. Origin: Native.
WTU 182495
Fred Zwickel 50    9 Jul 1949
32. Ceratophyllum demersum L.
Database ID
68332 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
182495 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
Fred Zwickel 
Collection #
50 
Other Collectors
 
Date Collected
9 Jul 1949 
Verbatim Date
 
Country
U.S.A. 
State or Province
Montana 
County
Lake 
Locality
3.5 miles south of Ronan. 
Elevation
3000 ft. 
Coordinates
T20N R20W 
Site Description
In small pothole alongside road. 
Specimen Notes
Abundant, pink sepals. 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
33. Ceratophyllum demersum L.
U.S.A., Montana, Missoula County:
Near Fort Missoula.
In slough in circa 3 feet deep water. Phenology: Fertile. Origin: Native.
WTU 224400
C. L. Hitchcock 23967    11 Jul 1965
33. Ceratophyllum demersum L.
Database ID
68335 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
224400 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
2. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 1986.
3. Ceratophyllum demersum L.
    Annotated by John A. Christy & Mark D. Sytma, 1994.  
Type Notes
 
Collector
C. L. Hitchcock 
Collection #
23967 
Other Collectors
 
Date Collected
11 Jul 1965 
Verbatim Date
 
Country
U.S.A. 
State or Province
Montana 
County
Missoula 
Locality
Near Fort Missoula. 
Elevation
 
Coordinates
 
Site Description
In slough in circa 3 feet deep water. 
Specimen Notes
 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
34. Ceratophyllum demersum L.
U.S.A., Oregon, Benton County:
Corvallis, Willamette park, off of the Willamette River.
Elev. 209 ft. T12S R5W S1. Datum: NAD 27. Coordinate uncertainty: 805 meters. Georeferenced by Ben Legler. Coordinate Source: TRS2LL. Invalid coordinates (located outside county bounds).
Small side slough off of river. Associated species: Elodea, Lemna, Myriophyllum, Callitriche, Phalaris. Plants submerged in still waters. Phenology: Fertile. Origin: Native.
WTU 334418
Richard R. Halse 5014    16 Nov 1995
34. Ceratophyllum demersum L.
Database ID
68340 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
334418 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Richard R. Halse 
Collection #
5014 
Other Collectors
 
Date Collected
16 Nov 1995 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Benton 
Locality
Corvallis, Willamette park, off of the Willamette River. 
Elevation
209 ft. 
Coordinates
T12S R5W S1 
Site Description
Small side slough off of river. Associated species: Elodea, Lemna, Myriophyllum, Callitriche, Phalaris. 
Specimen Notes
Plants submerged in still waters. 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
35. Ceratophyllum demersum L.
U.S.A., Washington, King County:
Shadow Lake.
47.4059° N, 122.087° W.
Phenology: Vegetative. Origin: Native.
WTU 363854
Steve Majerick     23 Aug 1996
with Wendy Cooke
35. Ceratophyllum demersum L.
Database ID
154476 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
363854 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Steve Majerick 
Collection #
 
Other Collectors
Wendy Cooke 
Date Collected
23 Aug 1996 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
Shadow Lake. 
Elevation
 
Coordinates
47.4059° N, 122.087° W 
Site Description
 
Specimen Notes
 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
36. Ceratophyllum demersum L.
U.S.A., Washington, Skagit County:
Heart Lake, naturally formed lake approximately 0.5 square mile in size.
Elev. 328 ft. 48° 28.494' N, 122° 37.702' W. Datum: WGS 84. Coordinate uncertainty: 7 meters.
Lake surrounded by coniferous forest; lake edge dominated by Salix, Nuphar, and Typha. Occasional in shallow waters near lake edge. Phenology: Vegetative. Origin: Native.
WTU 377685
David Giblin 756    4 Oct 2006
36. Ceratophyllum demersum L.
Database ID
157434 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
377685 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 25 2007. Sources: FNA.  
Type Notes
 
Collector
David Giblin 
Collection #
756 
Other Collectors
 
Date Collected
4 Oct 2006 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Skagit 
Locality
Heart Lake, naturally formed lake approximately 0.5 square mile in size. 
Elevation
328 ft. 
Coordinates
48° 28.494' N, 122° 37.702' W 
Site Description
Lake surrounded by coniferous forest; lake edge dominated by Salix, Nuphar, and Typha. 
Specimen Notes
Occasional in shallow waters near lake edge. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
37. Ceratophyllum demersum L.
U.S.A., Washington, Skagit County:
West shore of Cranberry Lake, ca. [circa] 2 air miles southwest of Anacortes.
Elev. 306 ft. 48° 30.245' N, 122° 38.711' W. Datum: WGS 84. Coordinate uncertainty: 6 meters. Coordinate Source: GPS.
Rocky shoreline under Pseudotsuga forest and Gaultheria shallon. Frequent; submerged in 1-2 meters of water. Phenology: Fertile. Origin: Native.
WTU 376637
Ben Legler 3684    16 Oct 2006
with David Giblin
37. Ceratophyllum demersum L.
Database ID
157465 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
376637 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 26 2007. Sources: FNA.  
Type Notes
 
Collector
Ben Legler 
Collection #
3684 
Other Collectors
David Giblin 
Date Collected
16 Oct 2006 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Skagit 
Locality
West shore of Cranberry Lake, ca. [circa] 2 air miles southwest of Anacortes. 
Elevation
306 ft. 
Coordinates
48° 30.245' N, 122° 38.711' W 
Site Description
Rocky shoreline under Pseudotsuga forest and Gaultheria shallon. 
Specimen Notes
Frequent; submerged in 1-2 meters of water. 
Phenology
Fertile 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
38. Ceratophyllum demersum L.
U.S.A., Washington, Stevens County:
Washington Department of Natural Resources Trust Lands. Coffin Lake, west bank.
Elev. 3125 ft. 48.5764° N, 117.555° W. Datum: WGS 84. Coordinate uncertainty: 9 meters. Coordinate Source: GPS.
5 hectare lake with silty muck bottom; Carex lanuginosus and C. utriculata common along shore; Elodea densa common along bottom of shallow water areas. Scattered in shallow water near lake edge. Phenology: Vegetative. Origin: Native.
WTU 380129
David Giblin 1177    6 Sep 2007
with Joe Arnett
38. Ceratophyllum demersum L.
Database ID
158843 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
380129 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 10 2007. Sources: FNA.  
Type Notes
 
Collector
David Giblin 
Collection #
1177 
Other Collectors
Joe Arnett 
Date Collected
6 Sep 2007 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Stevens 
Locality
Washington Department of Natural Resources Trust Lands. Coffin Lake, west bank. 
Elevation
3125 ft. 
Coordinates
48.5764° N, 117.555° W 
Site Description
5 hectare lake with silty muck bottom; Carex lanuginosus and C. utriculata common along shore; Elodea densa common along bottom of shallow water areas. 
Specimen Notes
Scattered in shallow water near lake edge. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
39. Ceratophyllum demersum L.
Canada, British Columbia
Okanagan, Okanagan Lake, Vernon Arm, on anchor, 200 meters, transect #3, depth of 15 feet, 82L-3W.
Elev. 1122 ft. 50° 15' N, 119° 21' W.
Royal British Columbia Museum Accession Number V175464. Origin: Native.
WTU 371259
Peter R. Newroth 640    25 May 1972
39. Ceratophyllum demersum L.
Database ID
169349 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
371259 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Donald H. Les, 24 1973.
2. Ceratophyllum demersum L.
    Annotated by Patrick D. Warrington, 1978.
3. Ceratophyllum demersum L.
    Annotated by Peter R. Newroth, 1986.  
Type Notes
 
Collector
Peter R. Newroth 
Collection #
640 
Other Collectors
 
Date Collected
25 May 1972 
Verbatim Date
 
Country
Canada 
State or Province
British Columbia 
County
 
Locality
Okanagan, Okanagan Lake, Vernon Arm, on anchor, 200 meters, transect #3, depth of 15 feet, 82L-3W. 
Elevation
1122 ft. 
Coordinates
50° 15' N, 119° 21' W 
Site Description
 
Specimen Notes
Royal British Columbia Museum Accession Number V175464. 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
40. Ceratophyllum demersum L.
Canada, British Columbia
Okanagan, Okanagan Lake, Vernon Arm, dredge #26 82L-3W.
Elev. 1122 ft. 50° 14' 30" N, 119° 21' 30" W.
Origin: Native.
WTU 371378
Peter R. Newroth     12 May 1972
40. Ceratophyllum demersum L.
Database ID
169454 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
371378 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Donald H. Les.
2. Ceratophyllum demersum L.
    Annotated by Patrick D. Warrington.
3. Ceratophyllum demersum L.
    Annotated by Peter R. Newroth.  
Type Notes
 
Collector
Peter R. Newroth 
Collection #
 
Other Collectors
 
Date Collected
12 May 1972 
Verbatim Date
 
Country
Canada 
State or Province
British Columbia 
County
 
Locality
Okanagan, Okanagan Lake, Vernon Arm, dredge #26 82L-3W. 
Elevation
1122 ft. 
Coordinates
50° 14' 30" N, 119° 21' 30" W 
Site Description
 
Specimen Notes
 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
41. Ceratophyllum demersum L.
U.S.A., Washington, Lincoln County:
U.S. Bureau of Land Management at Twin Lakes.
Elev. 1880 ft. 47.53065°, -118.5057°. Datum: WGS 84. Georeferenced by WTU Staff. Coordinate Source: GeoLocate.
Lake edge and riparian zone connecting the two lakes. Schoenoplectus and Veronica abundant and dominant in wet areas. Scabland/shrub-steppe community outside of riparian zone. Locally common near boat launch in water over 1 meter deep. Phenology: Vegetative. Origin: Native.
WTU 380537
David Giblin 1935    27 Jun 2008
41. Ceratophyllum demersum L.
Database ID
172094 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
380537 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 26 2009. Sources: FNA.  
Type Notes
 
Collector
David Giblin 
Collection #
1935 
Other Collectors
 
Date Collected
27 Jun 2008 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Lincoln 
Locality
U.S. Bureau of Land Management at Twin Lakes. 
Elevation
1880 ft. 
Coordinates
47.53065°, -118.5057° 
Site Description
Lake edge and riparian zone connecting the two lakes. Schoenoplectus and Veronica abundant and dominant in wet areas. Scabland/shrub-steppe community outside of riparian zone. 
Specimen Notes
Locally common near boat launch in water over 1 meter deep. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
42. Ceratophyllum demersum L.
U.S.A., Washington, Grant County:
Winchester Waterway. Starting at end of main access road and working back toward entrance.
Elev. 1121 ft. 47.11698° N, 119.62003° W. Datum: WGS 84. Coordinate uncertainty: 2 meters.
Lake edge dominated by Schoenoplectus acutus and Typha latifolia; surrounding shrub-steppe with Artemisia tridentata and Pseudoroegneria spicata. Washed up in clumps along shoreline. Phenology: Vegetative. Origin: Native.
WTU 380886
David Giblin 2373    29 Aug 2008
42. Ceratophyllum demersum L.
Database ID
174337 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
380886 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 7 2009. Sources: FNA.  
Type Notes
 
Collector
David Giblin 
Collection #
2373 
Other Collectors
 
Date Collected
29 Aug 2008 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Grant 
Locality
Winchester Waterway. Starting at end of main access road and working back toward entrance. 
Elevation
1121 ft. 
Coordinates
47.11698° N, 119.62003° W 
Site Description
Lake edge dominated by Schoenoplectus acutus and Typha latifolia; surrounding shrub-steppe with Artemisia tridentata and Pseudoroegneria spicata. 
Specimen Notes
Washed up in clumps along shoreline. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
43. Ceratophyllum demersum L.
U.S.A., Washington, Adams County:
Columbia National Wildlife Refuge. McMannaman Lake. From south end of lake along shoreline to northwest corner where stream feeds lake.
Elev. 820 ft. 46.90818° N, 119.2288° W. Datum: WGS 84. Coordinate uncertainty: 2 meters.
Lake in basalt rimrock dominated by Schoenoplectus acutus, Bulboschoenus sp., and Typha latifolia. Cirsium arvense invading peripheral upland. Uncommon; stems collected in water near lake outlet. Phenology: Vegetative. Origin: Native.
WTU 380475
David Giblin 2451    5 Sep 2008
43. Ceratophyllum demersum L.
Database ID
174415 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
380475 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 23 2009. Sources: FNA.  
Type Notes
 
Collector
David Giblin 
Collection #
2451 
Other Collectors
 
Date Collected
5 Sep 2008 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Adams 
Locality
Columbia National Wildlife Refuge. McMannaman Lake. From south end of lake along shoreline to northwest corner where stream feeds lake. 
Elevation
820 ft. 
Coordinates
46.90818° N, 119.2288° W 
Site Description
Lake in basalt rimrock dominated by Schoenoplectus acutus, Bulboschoenus sp., and Typha latifolia. Cirsium arvense invading peripheral upland. 
Specimen Notes
Uncommon; stems collected in water near lake outlet. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
44. Ceratophyllum demersum L.
U.S.A., Washington, Grant County:
Potholes Wildlife Area. Drainage slough west side of road, south side of slough. From roadside to 2 kilometers west of road.
Elev. 314 m. 47.08172° N, 119.34336° W. Datum: WGS 84. Coordinate uncertainty: 5 meters.
Shallow water of slough and adjacent sandy embankment up to 50 meters in from slough. Moisture gradient from saturated to dry and alkaline. Growing in shallow water of slough. Phenology: Vegetative. Origin: Native.
WTU 380324
David Giblin 2333    29 Aug 2008
44. Ceratophyllum demersum L.
Database ID
174464 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
380324 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 24 2009. Sources: FNA.  
Type Notes
 
Collector
David Giblin 
Collection #
2333 
Other Collectors
 
Date Collected
29 Aug 2008 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Grant 
Locality
Potholes Wildlife Area. Drainage slough west side of road, south side of slough. From roadside to 2 kilometers west of road. 
Elevation
314 m. 
Coordinates
47.08172° N, 119.34336° W 
Site Description
Shallow water of slough and adjacent sandy embankment up to 50 meters in from slough. Moisture gradient from saturated to dry and alkaline. 
Specimen Notes
Growing in shallow water of slough. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
45. Ceratophyllum demersum L.
U.S.A., Oregon, Harney County:
Near Knox Pond.
Elev. 4182 ft. 42° 53.5' N, 118° 52.9' W.
Muddy ditch and adjacent channel, over volcanic bedrock. Common in shallow water, submerged aquatic. Phenology: Vegetative. Origin: Native.
WTU 386666
Peter Zika 23218    22 Jul 2007
with J. Smith, D. Mansfield, D. Giblin
45. Ceratophyllum demersum L.
Database ID
175094 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
386666 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Rachel Malinen, 10 2008. Sources: FNA.  
Type Notes
 
Collector
Peter Zika 
Collection #
23218 
Other Collectors
J. Smith, D. Mansfield, D. Giblin 
Date Collected
22 Jul 2007 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Harney 
Locality
Near Knox Pond. 
Elevation
4182 ft. 
Coordinates
42° 53.5' N, 118° 52.9' W 
Site Description
Muddy ditch and adjacent channel, over volcanic bedrock. 
Specimen Notes
Common in shallow water, submerged aquatic. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
46. Ceratophyllum demersum L.
U.S.A., Oregon, Harney County:
South side of junction of Highway 205 and Diamond Grain Camp Road.
Irrigation ditch with slow-moving water. Below water surface; entwined with Potamogeton; common. Phenology: Vegetative. Origin: Native.
WTU 382700
David Giblin 04-139    6 Aug 2004
46. Ceratophyllum demersum L.
Database ID
178686 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
382700 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 4 2005. Sources: H&C.  
Type Notes
 
Collector
David Giblin 
Collection #
04-139 
Other Collectors
 
Date Collected
6 Aug 2004 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Harney 
Locality
South side of junction of Highway 205 and Diamond Grain Camp Road. 
Elevation
 
Coordinates
 
Site Description
Irrigation ditch with slow-moving water. 
Specimen Notes
Below water surface; entwined with Potamogeton; common. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
47. Ceratophyllum demersum L.
U.S.A., Washington, Yakima County:
Toppenish National Wildlife Refuge. Area near maintenance entrance from Highway 97.
Elev. 721 ft. 46.30806° N, 120.33533° W. Datum: WGS 84. Coordinate uncertainty: 5 meters.
Riparian strip dominated by Salix exigua and Phalaris arundinacea; adjacent shrub-steppe. Common in shallow water of creek. Phenology: Vegetative. Origin: Native.
WTU 393142
Don Knoke 1940    13 Aug 2009
with David Giblin
47. Ceratophyllum demersum L.
Database ID
180594 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
393142 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Don Knoke, 10 2011. Sources: H&C.  
Type Notes
 
Collector
Don Knoke 
Collection #
1940 
Other Collectors
David Giblin 
Date Collected
13 Aug 2009 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Yakima 
Locality
Toppenish National Wildlife Refuge. Area near maintenance entrance from Highway 97. 
Elevation
721 ft. 
Coordinates
46.30806° N, 120.33533° W 
Site Description
Riparian strip dominated by Salix exigua and Phalaris arundinacea; adjacent shrub-steppe. 
Specimen Notes
Common in shallow water of creek. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
48. Ceratophyllum demersum L.
U.S.A., Washington, Franklin County:
Scooteney Park Reservoir, about 15 miles south of Othello on Highway 17.
Small pond not attached to reservoir. Associates: Artemisia tridentata, and Agropyron sp.. (LB 4075). Phenology: Vegetative. Origin: Native.
WTU 384522
H. Bobisud 1103    23 May 1973
48. Ceratophyllum demersum L.
Database ID
182020 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
384522 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
H. Bobisud 
Collection #
1103 
Other Collectors
 
Date Collected
23 May 1973 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Franklin 
Locality
Scooteney Park Reservoir, about 15 miles south of Othello on Highway 17. 
Elevation
 
Coordinates
 
Site Description
Small pond not attached to reservoir. Associates: Artemisia tridentata, and Agropyron sp.. 
Specimen Notes
(LB 4075). 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
49. Ceratophyllum demersum L.
U.S.A., Washington, Franklin County:
Scootenay Reservoir. Cattail Lake, south shore where gravel access road leads to lake.
Elev. 283 m. 46.70307° N, 119.01243° W. Datum: WGS 84. Coordinate uncertainty: 5 meters. Georeferenced by Maria Yousoufian.
Lake shore edge dominated by Typha sp. Uncommon; broken pieces of stem along edge of lake. Phenology: Vegetative. Origin: Native.
WTU 400852; Barcode: WTU-V-007368
David Giblin 3257    29 Sep 2009
49. Ceratophyllum demersum L.
Database ID
187276 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
400852 
Barcode
WTU-V-007368 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Katie Messick, 23 2013. Sources: Flora of PNW.  
Type Notes
 
Collector
David Giblin 
Collection #
3257 
Other Collectors
 
Date Collected
29 Sep 2009 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Franklin 
Locality
Scootenay Reservoir. Cattail Lake, south shore where gravel access road leads to lake. 
Elevation
283 m. 
Coordinates
46.70307° N, 119.01243° W 
Site Description
Lake shore edge dominated by Typha sp. 
Specimen Notes
Uncommon; broken pieces of stem along edge of lake. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
50. Ceratophyllum demersum L.
U.S.A., Washington, Kittitas County:
Pond on north side of Woodhouse Loop Road (owned by Washington State Department of Transportation) at junction with Canyon Road.
46.95611° N, 120.5256° W. Datum: WGS 84. Coordinate uncertainty: 5 meters. Georeferenced by Maria Yousoufian.
Shallow water to 40 centimeters deep. Locally common on edge of pond. Phenology: Vegetative. Origin: Native.
WTU 393017
David Giblin 3292    5 Oct 2009
with Don Knoke
50. Ceratophyllum demersum L.
Database ID
187324 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
393017 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Katie Messick, 15 2013. Sources: FNA.  
Type Notes
 
Collector
David Giblin 
Collection #
3292 
Other Collectors
Don Knoke 
Date Collected
5 Oct 2009 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Kittitas 
Locality
Pond on north side of Woodhouse Loop Road (owned by Washington State Department of Transportation) at junction with Canyon Road. 
Elevation
 
Coordinates
46.95611° N, 120.5256° W 
Site Description
Shallow water to 40 centimeters deep. 
Specimen Notes
Locally common on edge of pond. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Ceratophyllaceae
51. Ceratophyllum demersum L.
U.S.A., Oregon, Deschutes County:
Hosmer Lake Campground and vicinity.
Elev. 1518 m. 43.96092° N, 121.7861° W. Coordinate Source: GPS.
Wet meadow dominated by Carex and grasses grading into lake shallows, bordered on upland side by dry Pinus contorta woodland. Submersed in Hosmer Lake. Phenology: Vegetative. Origin: Native.
WTU 409567; Barcode: WTU-V-023565
Suzanne Anderson 2013-39    13 Jul 2013
with Karen Petersen, Katie Messick, Sheila Olmstead, and R. Olmstead
51. Ceratophyllum demersum L.
Database ID
190156 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
409567 
Barcode
WTU-V-023565 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Katie Messick, 17 2013. Sources: FNA.  
Type Notes
 
Collector
Suzanne Anderson 
Collection #
2013-39 
Other Collectors
Karen Petersen, Katie Messick, Sheila Olmstead, and R. Olmstead 
Date Collected
13 Jul 2013 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Deschutes 
Locality
Hosmer Lake Campground and vicinity. 
Elevation
1518 m. 
Coordinates
43.96092° N, 121.7861° W 
Site Description
Wet meadow dominated by Carex and grasses grading into lake shallows, bordered on upland side by dry Pinus contorta woodland. 
Specimen Notes
Submersed in Hosmer Lake. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
52. Ceratophyllum demersum L.
U.S.A., Washington, Kitsap County:
Buck Lake just west of Hansville; boat ramp.
Elev. 30 m. 47.91112° N, 122.55831° W. Datum: WGS 84. Coordinate uncertainty: 10 meters. Coordinate Source: Digital map.
Shallow water where free-floating aquatic vegetation accumulated. Clumps of unrooted stems in shallow water. Phenology: Vegetative. Origin: Native.
WTU 418335; Barcode: WTU-V-039339
David Giblin 5496    25 Jan 2015
52. Ceratophyllum demersum L.
Database ID
2490443 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
418335 
Barcode
WTU-V-039339 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 4 2015. Sources: FNA.  
Type Notes
 
Collector
David Giblin 
Collection #
5496 
Other Collectors
 
Date Collected
25 Jan 2015 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Kitsap 
Locality
Buck Lake just west of Hansville; boat ramp. 
Elevation
30 m. 
Coordinates
47.91112° N, 122.55831° W 
Site Description
Shallow water where free-floating aquatic vegetation accumulated. 
Specimen Notes
Clumps of unrooted stems in shallow water. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
53. Ceratophyllum demersum L.
U.S.A., Washington, Grant County:
Buckshot Recreation Area. Area west of hunting blind approximately 300 meters north of parking area.
Elev. 145 m. 46.71344° N, 119.95304° W. Datum: WGS 84. Coordinate uncertainty: 50 meters. Coordinate Source: Digital map.
Backwater channel of Columbia River with Schoenoplectus acutus and Lythrum salicaria abundant. Scattered in water to 1 meter deep. Phenology: Vegetative. Origin: Native.
WTU 409673; Barcode: WTU-V-023638
David Giblin 5793    18 Sep 2015
53. Ceratophyllum demersum L.
Database ID
2500918 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
409673 
Barcode
WTU-V-023638 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 25 2015. Sources: Flora of PNW Draft.  
Type Notes
 
Collector
David Giblin 
Collection #
5793 
Other Collectors
 
Date Collected
18 Sep 2015 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Grant 
Locality
Buckshot Recreation Area. Area west of hunting blind approximately 300 meters north of parking area. 
Elevation
145 m. 
Coordinates
46.71344° N, 119.95304° W 
Site Description
Backwater channel of Columbia River with Schoenoplectus acutus and Lythrum salicaria abundant. 
Specimen Notes
Scattered in water to 1 meter deep. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
54. Ceratophyllum demersum L.
U.S.A., Washington, Lewis County:
North shore of Swofford Pond adjacent to Green Mountain Road, 7.1 air km southeast of Mossyrock.
Elev. 226 m. 46.502316° N, 122.399353° W. Datum: WGS 84. Coordinate uncertainty: 4 meters. Georeferenced by Ben Legler. Coordinate Source: GPS.
Steep shoreline edged by scattered Alnus rubra, with Rubus and Leersia; tannin stained water with Brasenia and Elodea. Occasional submerged aquatic in shallows. Phenology: Vegetative.
WTU 408058; Barcode: WTU-V-021224
Ben Legler 13394    23 Sep 2014
with Sara Legler
54. Ceratophyllum demersum L.
Database ID
2782189 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
408058 
Barcode
WTU-V-021224 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by Ben Legler, 2014.  
Type Notes
 
Collector
Ben Legler 
Collection #
13394 
Other Collectors
Sara Legler 
Date Collected
23 Sep 2014 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Lewis 
Locality
North shore of Swofford Pond adjacent to Green Mountain Road, 7.1 air km southeast of Mossyrock. 
Elevation
226 m. 
Coordinates
46.502316° N, 122.399353° W 
Site Description
Steep shoreline edged by scattered Alnus rubra, with Rubus and Leersia; tannin stained water with Brasenia and Elodea. 
Specimen Notes
Occasional submerged aquatic in shallows. 
Phenology
Vegetative 
Origin
 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
55. Ceratophyllum demersum L.
U.S.A., Washington, King County:
In mouth of Juanita Creek, Juanita Bay, Lake Washington, Juanita, Kirkland.
Elev. 5 m. 47.7041° N, 122.2178° W. Coordinate Source: Specimen Label.
Partial shade of Alnus rubra, with Potamogeton richardsonii, P. crispus, Elodea canadensis. Local submerged aquatic. Origin: Native.
WTU 409790; Barcode: WTU-V-023784
Peter F. Zika 28073    12 Jul 2016
55. Ceratophyllum demersum L.
Database ID
3102618 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
409790 
Barcode
WTU-V-023784 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Peter F. Zika 
Collection #
28073 
Other Collectors
 
Date Collected
12 Jul 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
King 
Locality
In mouth of Juanita Creek, Juanita Bay, Lake Washington, Juanita, Kirkland. 
Elevation
5 m. 
Coordinates
47.7041° N, 122.2178° W 
Site Description
Partial shade of Alnus rubra, with Potamogeton richardsonii, P. crispus, Elodea canadensis. 
Specimen Notes
Local submerged aquatic. 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
56. Ceratophyllum demersum L.
U.S.A., Washington, Chelan County:
W shore of Columbia River, near Cowan Avenue, 4.9 air km ENE of Peters Point, Entiat.
Elev. 215 m. 47.6669° N, 120.2185° W. Coordinate Source: Specimen Label.
In shallow water, mud and gravel shoreline, full sun, with Potamegeton crispus, P. richardsonii, Myriophyllum spicatum. Submerged aquatic in shallow water. Phenology: Vegetative. Origin: Native.
WTU 412892; Barcode: WTU-V-028400
Peter F. Zika 28521    1 Oct 2016
56. Ceratophyllum demersum L.
Database ID
3145643 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
412892 
Barcode
WTU-V-028400 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Peter F. Zika 
Collection #
28521 
Other Collectors
 
Date Collected
1 Oct 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Chelan 
Locality
W shore of Columbia River, near Cowan Avenue, 4.9 air km ENE of Peters Point, Entiat.  
Elevation
215 m. 
Coordinates
47.6669° N, 120.2185° W 
Site Description
In shallow water, mud and gravel shoreline, full sun, with Potamegeton crispus, P. richardsonii, Myriophyllum spicatum.  
Specimen Notes
Submerged aquatic in shallow water.  
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
57. Ceratophyllum demersum L.
U.S.A., Washington, Cowlitz County:
Ditch no. 10, SE corner of junction of Routes 4 & 432, Longview.
Elev. 4 m. 46.176° N, 123.0247° W. Coordinate Source: Specimen Label.
In slough, full sun, with Myriophyllum aquaticum, Ludwigia hexapetala. Submerged aquatic, stems to 1 m, common. Origin: Native.
WTU 412546; Barcode: WTU-V-027110
Peter F. Zika 28296    14 Aug 2016
57. Ceratophyllum demersum L.
Database ID
3146051 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
412546 
Barcode
WTU-V-027110 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Peter F. Zika 
Collection #
28296 
Other Collectors
 
Date Collected
14 Aug 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Cowlitz 
Locality
Ditch no. 10, SE corner of junction of Routes 4 & 432, Longview.  
Elevation
4 m. 
Coordinates
46.176° N, 123.0247° W 
Site Description
In slough, full sun, with Myriophyllum aquaticum, Ludwigia hexapetala.  
Specimen Notes
Submerged aquatic, stems to 1 m, common.  
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
58. Ceratophyllum demersum L.
U.S.A., Washington, Island County:
In Cranberry Lake in Deception Pass State Park.
48.39249° N, 122.64941° W. Georeferenced by Maria Yousoufian. Coordinate Source: Specimen Label.
Growing with Myriophyllum sibiricum, Potamogeton praelongus, P. amplifolius, Lemna trisulca, and Ceratophyllum echinatum. Origin: Native.
WTU 414423; Barcode: WTU-V-030092
Jeff Walker 879    1 Sep 2016
58. Ceratophyllum demersum L.
Database ID
3149986 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
414423 
Barcode
WTU-V-030092 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Jeff Walker 
Collection #
879 
Other Collectors
 
Date Collected
1 Sep 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Island 
Locality
In Cranberry Lake in Deception Pass State Park. 
Elevation
 
Coordinates
48.39249° N, 122.64941° W 
Site Description
Growing with Myriophyllum sibiricum, Potamogeton praelongus, P. amplifolius, Lemna trisulca, and Ceratophyllum echinatum.  
Specimen Notes
 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
59. Ceratophyllum demersum L.
U.S.A., Washington, Snohomish County:
Boeing Lake.
Elev. 530 ft. 47.91515° N, 122.27607° W. Coordinate Source: Specimen Label.
Growing with Nuphar polysepala and Nymphaea odorata. Common in lake. Origin: Native.
WTU 414203; Barcode: WTU-V-031141
Jeff Walker 908    7 Nov 2016
59. Ceratophyllum demersum L.
Database ID
3151892 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
414203 
Barcode
WTU-V-031141 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Jeff Walker 
Collection #
908 
Other Collectors
 
Date Collected
7 Nov 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Snohomish 
Locality
Boeing Lake. 
Elevation
530 ft. 
Coordinates
47.91515° N, 122.27607° W 
Site Description
Growing with Nuphar polysepala and Nymphaea odorata. 
Specimen Notes
Common in lake. 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
60. Ceratophyllum demersum L.
U.S.A., Oregon, Morrow County:
Marshy margin of south shore of Lake Umatilla reservoir on Columbia River, 8.5 air kilometers southwest of Crow Butte Island.
Elev. 80 m. 45.8135° N, 119.959° W. Coordinate Source: Specimen Label.
In dense beds of aquatics in shallow water, full sun, over basalt, with Elodea nuttallii, Potamogeton gramineus, P. richardsonii, P. crispus, Stuckenia pectinata, Zannichellia palustris, Heteranthera dubia. Occasional submerged aquatic. Origin: Native.
WTU 416491; Barcode: WTU-V-035410
Peter F. Zika 29062    19 Aug 2017
60. Ceratophyllum demersum L.
Database ID
3152108 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
416491 
Barcode
WTU-V-035410 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Peter F. Zika 
Collection #
29062 
Other Collectors
 
Date Collected
19 Aug 2017 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Morrow 
Locality
Marshy margin of south shore of Lake Umatilla reservoir on Columbia River, 8.5 air kilometers southwest of Crow Butte Island. 
Elevation
80 m. 
Coordinates
45.8135° N, 119.959° W 
Site Description
In dense beds of aquatics in shallow water, full sun, over basalt, with Elodea nuttallii, Potamogeton gramineus, P. richardsonii, P. crispus, Stuckenia pectinata, Zannichellia palustris, Heteranthera dubia. 
Specimen Notes
Occasional submerged aquatic. 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
61. Ceratophyllum demersum L.
U.S.A., Oregon, Gilliam County:
South shore of Lake Umatilla reservoir on Columbia River, near Blalock Canyon boat ramp, north of Interstate 84, 13.5 air kilometers west-southwest of Arlington.
Elev. 80 m. 45.6962° N, 120.3724° W. Coordinate Source: Specimen Label.
Uncommon submerged aquatic, rocky bottom, in 0.5 - 1 meters water, full sun, over basalt, with Heteranthera dubia, Myriophyllum spicatum, Elodea canadensis. Origin: Native.
WTU 416499; Barcode: WTU-V-035413
Peter F. Zika 29052    19 Aug 2017
61. Ceratophyllum demersum L.
Database ID
3186195 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
416499 
Barcode
WTU-V-035413 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Peter F. Zika 
Collection #
29052 
Other Collectors
 
Date Collected
19 Aug 2017 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Gilliam 
Locality
South shore of Lake Umatilla reservoir on Columbia River, near Blalock Canyon boat ramp, north of Interstate 84, 13.5 air kilometers west-southwest of Arlington. 
Elevation
80 m. 
Coordinates
45.6962° N, 120.3724° W 
Site Description
Uncommon submerged aquatic, rocky bottom, in 0.5 - 1 meters water, full sun, over basalt, with Heteranthera dubia, Myriophyllum spicatum, Elodea canadensis. 
Specimen Notes
 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
62. Ceratophyllum demersum L.
U.S.A., Washington, Spokane County:
Spokane; Three Springs Natural Area on the Spokane River.
Growing with Juncus acuminatus, Salix lasiandra and Rorippa nasturtium-aquatica. Origin: Native.
WTU 413315; Barcode: WTU-V-028894
Kathy Ahlenslager 441    23 Jun 1994
with Robert Bursik
62. Ceratophyllum demersum L.
Database ID
3186199 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
413315 
Barcode
WTU-V-028894 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Kathy Ahlenslager 
Collection #
441 
Other Collectors
Robert Bursik 
Date Collected
23 Jun 1994 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Spokane 
Locality
Spokane; Three Springs Natural Area on the Spokane River. 
Elevation
 
Coordinates
 
Site Description
Growing with Juncus acuminatus, Salix lasiandra and Rorippa nasturtium-aquatica. 
Specimen Notes
 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
63. Ceratophyllum demersum L.
U.S.A., Washington, Stevens County:
Jump Off Joe Lake Boat Launch, about 10 miles south of Chewelah.
T31N R40E S31. Datum: WGS 84. Coordinate uncertainty: 793 meters. Georeferenced by Dan Post. Coordinate Source: Digital Map.
Growing with Carex bebbii, Juncus tenuis and Lemna minor. Origin: Native.
WTU 413314; Barcode: WTU-V-028896
Kathy Ahlenslager 420    25 Jun 1994
with Robert Bursik
63. Ceratophyllum demersum L.
Database ID
3186200 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
413314 
Barcode
WTU-V-028896 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Kathy Ahlenslager 
Collection #
420 
Other Collectors
Robert Bursik 
Date Collected
25 Jun 1994 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Stevens 
Locality
Jump Off Joe Lake Boat Launch, about 10 miles south of Chewelah. 
Elevation
 
Coordinates
T31N R40E S31 
Site Description
Growing with Carex bebbii, Juncus tenuis and Lemna minor. 
Specimen Notes
 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
64. Ceratophyllum demersum L.
U.S.A., Oregon, Multnomah County:
Stormwater pond next to Portland International Raceway.
45.5957° N, 122.7004° W. Coordinate Source: Specimen Label.
Large, shallow, steep-banked stormwater pond. Connected to Columbia Slough via side channels.¶Potamogeton crispus, Lemna minor, Stuckenia pectinata, Spirodela. Vegetative. Abundant in deeper parts of pond (>1 meter). Phenology: Vegetative. Origin: Native.
WTU 416739; Barcode: WTU-V-036370
Dominic Maze 177    2 Aug 2016
64. Ceratophyllum demersum L.
Database ID
3187590 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
416739 
Barcode
WTU-V-036370 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Dominic Maze 
Collection #
177 
Other Collectors
 
Date Collected
2 Aug 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Multnomah 
Locality
Stormwater pond next to Portland International Raceway. 
Elevation
 
Coordinates
45.5957° N, 122.7004° W 
Site Description
Large, shallow, steep-banked stormwater pond. Connected to Columbia Slough via side channels.¶Potamogeton crispus, Lemna minor, Stuckenia pectinata, Spirodela. 
Specimen Notes
Vegetative. Abundant in deeper parts of pond (>1 meter). 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
65. Ceratophyllum demersum L.
U.S.A., Washington, Stevens County:
W shore of Pierre Lake, near boat ramp and campground, 2.8 air km NW of Hungry Hill, E of FS Road 4013.
Elev. 615 m. 48.9051° N, 118.1406° W. Coordinate Source: Specimen Label.
Sunny marsh, with Potamogeton natans, Phalaris arundinacea, Iris pseudacorus. Submerged aquatic, leaves fork 1-2 times; common in 0.5 m of water. Origin: Native.
WTU 412149; Barcode: WTU-V-026597
Peter F. Zika 28367    30 Aug 2016
65. Ceratophyllum demersum L.
Database ID
3214468 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
412149 
Barcode
WTU-V-026597 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Peter F. Zika 
Collection #
28367 
Other Collectors
 
Date Collected
30 Aug 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Stevens 
Locality
W shore of Pierre Lake, near boat ramp and campground, 2.8 air km NW of Hungry Hill, E of FS Road 4013. 
Elevation
615 m. 
Coordinates
48.9051° N, 118.1406° W 
Site Description
Sunny marsh, with Potamogeton natans, Phalaris arundinacea, Iris pseudacorus. 
Specimen Notes
Submerged aquatic, leaves fork 1-2 times; common in 0.5 m of water. 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
66. Ceratophyllum demersum L.
U.S.A., Oregon, Multnomah County:
Side channel of Columbia Slough.
45.5644° N, 122.5415° W. Coordinate Source: Specimen Label.
Spring-fed section of Columbia Slough. Clear and cold water. Spirodela, Lemna, Hydrocotyl, Callitriche stagnalis. Vegetative. In water column. Common. Origin: Native.
WTU 417321; Barcode: WTU-V-037137
Dominic Maze 240    21 Jul 2016
66. Ceratophyllum demersum L.
Database ID
3218441 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
417321 
Barcode
WTU-V-037137 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Dominic Maze 
Collection #
240 
Other Collectors
 
Date Collected
21 Jul 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Multnomah 
Locality
Side channel of Columbia Slough. 
Elevation
 
Coordinates
45.5644° N, 122.5415° W 
Site Description
Spring-fed section of Columbia Slough. Clear and cold water. Spirodela, Lemna, Hydrocotyl, Callitriche stagnalis. 
Specimen Notes
Vegetative. In water column. Common. 
Phenology
 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
67. Ceratophyllum demersum L.
U.S.A., Oregon, Multnomah County:
Ramsey Lake.
45.6234° N, 122.7612° W. Coordinate Source: Specimen Label.
Ludwigia peploides ssp. montevidensis, Schoenoplectus, Lindernia dubia, Lythrum salicaria. Vegetative Phenology: Vegetative. Origin: Native.
WTU 417412; Barcode: WTU-V-037442
Dominic Maze 250    14 Jul 2016
67. Ceratophyllum demersum L.
Database ID
3218878 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
417412 
Barcode
WTU-V-037442 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.  
Type Notes
 
Collector
Dominic Maze 
Collection #
250 
Other Collectors
 
Date Collected
14 Jul 2016 
Verbatim Date
 
Country
U.S.A. 
State or Province
Oregon 
County
Multnomah 
Locality
Ramsey Lake. 
Elevation
 
Coordinates
45.6234° N, 122.7612° W 
Site Description
Ludwigia peploides ssp. montevidensis, Schoenoplectus, Lindernia dubia, Lythrum salicaria. 
Specimen Notes
Vegetative 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
68. Ceratophyllum demersum L.
U.S.A., Washington, Jefferson County:
Leland Lake Recreation Area. Approximately 100m west to 110 east of boat ramp.
Elev. 66 m. 47.89784° N, 122.87675° W. Datum: WGS 84. Coordinate uncertainty: 100 meters. Coordinate Source: GPS.
Lake shoreline and water to 1m deep; shoreline dominated by Phalaris arundinacea and adjacent lake water by Potamogeton sp. and Elodea nuttallii. Uncommon in water to 0.5 meters deep. Phenology: Sterile. Origin: Native.
WTU 419850; Barcode: WTU-V-043577
David Giblin 6332    29 Aug 2018
68. Ceratophyllum demersum L.
Database ID
3231762 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
419850 
Barcode
WTU-V-043577 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 25 2018. Sources: Draft Revised Flora of PNW.  
Type Notes
 
Collector
David Giblin 
Collection #
6332 
Other Collectors
 
Date Collected
29 Aug 2018 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Jefferson 
Locality
Leland Lake Recreation Area. Approximately 100m west to 110 east of boat ramp.  
Elevation
66 m. 
Coordinates
47.89784° N, 122.87675° W 
Site Description
Lake shoreline and water to 1m deep; shoreline dominated by Phalaris arundinacea and adjacent lake water by Potamogeton sp. and Elodea nuttallii.  
Specimen Notes
Uncommon in water to 0.5 meters deep.  
Phenology
Sterile 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
69. Ceratophyllum demersum L.
U.S.A., Washington, Skamania County:
Greenleaf Lake on north side of Highway 14; boat ramp area and shoreline approximately 100 meters to the west.
Elev. 21 m. 45.64738° N, 121.95698° W. Datum: WGS 84. Coordinate uncertainty: 200 meters. Coordinate Source: GPS.
Former oxbow now impounded by road; disturbed shoreline with Leersia oryzoides, Iris pseudacorus and Rubus bifrons. Scattered in shallow water. Phenology: Vegetative. Origin: Native.
WTU 420192; Barcode: WTU-V-044330
David Giblin 6387    25 Oct 2018
69. Ceratophyllum demersum L.
Database ID
3246016 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
420192 
Barcode
WTU-V-044330 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 1 2018. Sources: Flora PNW, 2nd.  
Type Notes
 
Collector
David Giblin 
Collection #
6387 
Other Collectors
 
Date Collected
25 Oct 2018 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Skamania 
Locality
Greenleaf Lake on north side of Highway 14; boat ramp area and shoreline approximately 100 meters to the west. 
Elevation
21 m. 
Coordinates
45.64738° N, 121.95698° W 
Site Description
Former oxbow now impounded by road; disturbed shoreline with Leersia oryzoides, Iris pseudacorus and Rubus bifrons.  
Specimen Notes
Scattered in shallow water. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
70. Ceratophyllum demersum L.
U.S.A., Washington, Skamania County:
Home Valley Waterfront Park. Sailboard Beach access area approximately 200 meters east and west along shoreline.
Elev. 34 m. 45.7094° N, 121.78011° W. Datum: WGS 84. Coordinate uncertainty: 200 meters. Coordinate Source: GPS.
Shoreline, wetland, and adjacent shallow waters; shoreline dominated by Amorpha fruticosa, Salix sp. (narrow leaves), and Persicarnia sp.; Myriophyllum sp. common in shallow water. Scattered in open water to 40 centimeters deep. Phenology: Vegetative. Origin: Native.
WTU 420241; Barcode: WTU-V-044381
David Giblin 6419    12 Sep 2018
70. Ceratophyllum demersum L.
Database ID
3246071 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
420241 
Barcode
WTU-V-044381 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 23 2018. Sources: Flora PNW, 2nd.  
Type Notes
 
Collector
David Giblin 
Collection #
6419 
Other Collectors
 
Date Collected
12 Sep 2018 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Skamania 
Locality
Home Valley Waterfront Park. Sailboard Beach access area approximately 200 meters east and west along shoreline. 
Elevation
34 m. 
Coordinates
45.7094° N, 121.78011° W 
Site Description
Shoreline, wetland, and adjacent shallow waters; shoreline dominated by Amorpha fruticosa, Salix sp. (narrow leaves), and Persicarnia sp.; Myriophyllum sp. common in shallow water.  
Specimen Notes
Scattered in open water to 40 centimeters deep. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
71. Ceratophyllum demersum L.
U.S.A., Washington, Skamania County:
Icehouse Lake and adjacent old beaver ponds on north end. North side of Highway 14 at intersection with Bridge of the Gods.
Elev. 49 m. 45.66138° N, 121.90633° W. Datum: WGS 84. Coordinate uncertainty: 200 meters. Coordinate Source: GPS.
Eutrophic ponds with shoreline of main pond dominated by Iris pseudacorus, Typha latifolia, Leersia oryzoides and Juncus effusus; beaver ponds less disturbed with Bidens cernua common along shoreline with Equisetum telmateia. Locally common in main pond in water to 0.5 meters deep. Phenology: Vegetative. Origin: Native.
WTU 420635; Barcode: WTU-V-048416
David Giblin 6454    13 Sep 2018
71. Ceratophyllum demersum L.
Database ID
3246750 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
420635 
Barcode
WTU-V-048416 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 24 2018. Sources: Flora PNW, 2nd.  
Type Notes
 
Collector
David Giblin 
Collection #
6454 
Other Collectors
 
Date Collected
13 Sep 2018 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Skamania 
Locality
Icehouse Lake and adjacent old beaver ponds on north end. North side of Highway 14 at intersection with Bridge of the Gods. 
Elevation
49 m. 
Coordinates
45.66138° N, 121.90633° W 
Site Description
Eutrophic ponds with shoreline of main pond dominated by Iris pseudacorus, Typha latifolia, Leersia oryzoides and Juncus effusus; beaver ponds less disturbed with Bidens cernua common along shoreline with Equisetum telmateia. 
Specimen Notes
Locally common in main pond in water to 0.5 meters deep. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
72. Ceratophyllum demersum L.
U.S.A., Washington, Okanogan County:
Highway 97 public access area on east bank of Columbia River. Approximately 15km south of Pateros.
Elev. 236 m. 47.98381° N, 119.8882° W. Datum: WGS 84. Coordinate uncertainty: 200 meters. Coordinate Source: GPS.
Disturbed edge of parking area and adjacent muddy shoreline; Elaegnus angustifolia and Juniperus scopulorum common at edge of parking area; Lythrum salicaria common along shoreline. Broken stems washed up along shoreline. Phenology: Vegetative. Origin: Native.
WTU 420447; Barcode: WTU-V-047152
David Giblin 6488    2 Oct 2018
72. Ceratophyllum demersum L.
Database ID
3249084 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
420447 
Barcode
WTU-V-047152 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 14 2019. Sources: Flora PNW, 2nd.  
Type Notes
 
Collector
David Giblin 
Collection #
6488 
Other Collectors
 
Date Collected
2 Oct 2018 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Okanogan 
Locality
Highway 97 public access area on east bank of Columbia River. Approximately 15km south of Pateros. 
Elevation
236 m. 
Coordinates
47.98381° N, 119.8882° W 
Site Description
Disturbed edge of parking area and adjacent muddy shoreline; Elaegnus angustifolia and Juniperus scopulorum common at edge of parking area; Lythrum salicaria common along shoreline. 
Specimen Notes
Broken stems washed up along shoreline. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
Yes 

Ceratophyllaceae
73. Ceratophyllum demersum L.
U.S.A., Washington, Douglas County:
East side of Columbia River along Highway 97, approximately 20 km north of Wenatchee.
Elev. 215 m. 47.66523° N, 120.20728° W. Datum: WGS 84. Coordinate uncertainty: 50 meters. Coordinate Source: GPS.
Shallow water and adjacent disturbed shoreline with Lythrum salicaria, Ulmus pumila and Populus trichocarpa common. Locally common in shallow water with silty soils; rhizomatous. Phenology: Vegetative. Origin: Native.
WTU
David Giblin 6569    4 Oct 2018
73. Ceratophyllum demersum L.
Database ID
3252292 
Herbarium
WTU 
Collection
Vascular Plants 
Dataset
 
Accession
 
Barcode
 
Other Numbers
 
Family
Ceratophyllaceae 
Name on Specimen
Ceratophyllum demersum L. 
Accepted Name
Ceratophyllum demersum L. 
Annotation History
1. Ceratophyllum demersum L.
    Annotated by David Giblin, 5 2019. Sources: Flora PNW, 2nd.  
Type Notes
 
Collector
David Giblin 
Collection #
6569 
Other Collectors
 
Date Collected
4 Oct 2018 
Verbatim Date
 
Country
U.S.A. 
State or Province
Washington 
County
Douglas 
Locality
East side of Columbia River along Highway 97, approximately 20 km north of Wenatchee.  
Elevation
215 m. 
Coordinates
47.66523° N, 120.20728° W 
Site Description
Shallow water and adjacent disturbed shoreline with Lythrum salicaria, Ulmus pumila and Populus trichocarpa common. 
Specimen Notes
Locally common in shallow water with silty soils; rhizomatous. 
Phenology
Vegetative 
Origin
Native 
Cultivated?
No 
Imaged?
No 

Tab-delimited Text File:
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Database Field Descriptions:
Database ID
Each of our backend databases assigns a unique and persistent integer ID to each specimen record. A GUID (globally unique identifier) can be formed from this by combining it with the herbarium and collection acronyms (example: WTU-VP-12733).
Herbarium
Every herbarium is referred to by a unique acronym. Ours is WTU, which stands for Washington Territorial University. Our database also includes some specimens housed at NOCA (North Cascades National Park Herbarium) and MORA (Mount Rainier National Park Herbarium). For a complete listing of herbarium acronyms, see Index Herbariorum.
Collection
WTU's specimens are physically housed in separate collections according to taxonomic groups: Vascular Plants, Bryophytes, Algae, Lichens, and Fungi.
Dataset
Some specimens are grouped into "Datasets," representing such things as incorporated herbaria or major collecting projects.
Accession
Each of WTU's Vascular Plant specimens is assigned an accession number. Our other collections lack accession numbers (see Barcode instead). Ideally, each specimen would have a unique accession number, but this fails in practice. Some accession numbers include "JWT" after the number; these indicate specimens originating from the herbarium of J. William Thompson that were integrated into WTU's collections but not re-accessioned with WTU numbers. Accession numbers followed by an "A", "B", or other single letter represent sheets with multiple collections mounted on them, all using the same accession number.
Barcode
Our Bryophyte, Algae, Lichen, Fungi, and some Vascular Plant specimens are assigned pre-printed barcode stickers. These follow the format "WTU-C-######", where C represents a code for the collection (one of: V, B, A, L, F) and ###### represents a zero-padded, six-digit number.
Other Numbers
Specimens collected from North Cascades and Mount Rainier National Parks are assigned National Park Service accession and catalog numbers. These numbers are listed here.
Family
The scientific name of the family. Our database generally uses AGPIII and other current sources for vascular plant family names. However, our physical Vascular Plant collection is organized by the older Englerian sequence.
Accepted Name
For Vascular Plants, this gives the accepted name by which the specimen is currently known. The accepted name is derived by looking up the most recent annotation name in a synonymy table and finding its corresponding accepted name.
Annotation History
The sequence of annotations and scientific names given on the physical specimen is listed here, in order from the first to most recent. We treat the name on the original label as the first annotation.
Type Notes
If this is a type specimen, then information about its type status (holotype, isotype, etc.) and the name(s) for which it is a type is provided here.
Collector
The person who collected this specimen, as given on the label, and whose name is associated with the collection number on the label. If no collector name is given, we enter "unknown" into this field.
Collection #
A unique number assigned to the specimen by the collector. Different collectors use different numbering schemes; these may include the addition of prefixes (such as their initials or the year) or suffixes (such as an A or B). In the database, any prefixes and suffixes are included in the Collector's Number field exactly as they appear on the specimen label. When no collector number is given, we type "s.n." in this field.
Other Collectors
Other collectors that are listed on the label along with the primary collector, but whose collection number was not assigned to this specimen.
Date Collected
The date on which the specimen was collected, split up between day, month, and year in the database. Months are stored as nubmers (1-12) but displayed as three-letter abbreviations. Years are alway 4-digits long. Occasionally the label may give a range of dates. In such cases, the first date in the range is used as the collection date, and the entire collection date is entered into the Verbatim Date field as it appears on the label. If no date is given, then the date fields are left blank and a note is made in the Verbatim Date field.
Verbatim Date
The literal date string as displayed on the label; only used for dates that cannot be represented by a single day, month, and year.
Country
Name of the country from which the specimen was collected. Specimens from the United States of America are entered as "U.S.A."
State or Province
Name of the state or province from which the specimen was collected, if given on the label. U.S. states are spelled out in full.
County
Name of the county, municipality, borough, parish, or equivalent political unit from which the specimen was collected, if given on the label. The designation (such as "county") is not included in the field value.
Locality
A text description of the location where the specimen was collected, as given on the specimen label. May include national park, national forest, and other land use designations. Older collections often have short and imprecise locality data. Detailed locality data for rare species (threatened, endangered, sensitive, watch, ...) is included in our database but omitted from the search results.
Elevation
Elevations may be given either in feet or meters, and may include a minimum and maximum elevation, representing a range.
Coordinates
May include TRS/PLSS (township, range, section, quarter, etc.), latitude/longitude, and UTM. Coordinates for arare species are included in our database but omittedfrom the search results.
Site Description
This field includes all label information characterizing the site, such habitat, vegetation zone/association, substrate, slope, moisture, associated species, and so on - as the information appears on the specimen label.
Specimen Notes
Includes any characteristics pertaining to the plant specimen itself, such as flower color, fruit length, and plant height, along with information about the species, such as abundance and the precise location and micro-habitat where collected. Also includes any notes or text on the specimen that does not better fit into another field.
Phenology
Specifies the sexual maturity/condition of the specimen, such as flowering, fruiting, cone-bearing, spore-bearing, fertile, or sterile. Phenology is generally not given on the label; instead the person entering the record examines the specimen and selects the appropriate value.
Origin
Specifies whether the specimen is native or introduced to the state or country where it was collected. Origin data is rarely found on the specimen label; instead, it is entered during data entry either from a lookup table or from the date entry personnel's own knowledge. Origin data should be considered supplemental information, and should not be relied on as authoritative.
Cultivated
A Yes/No flag indicating if this is a cultivated specimen. Cultivated specimens generally do not represent valid distribution records and should be excluded from range maps or other geographic analyses.


Disclaimer:

WTU makes a reasonable effort to prevent and correct data entry errors; however, we cannot guarantee that our database is free from typos, misidentifications, or inaccurate label data. Please use the information at your own discretion. Error corrections and comments can be sent to Ben Legler or David Giblin.