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Herbarium
flowering purple butterfly bush

Graduate student John Chau discovers the origin of the Butterfly-bush, a familiar flowering plant in the Seattle area.

A Burke Museum graduate student travels to Colombia to study the tropical diversity of river-weed plants. 

preserved plant specimen on page with herbarium stamp

More than 2.4 million plant, fungal, lichen, and algal specimen records from the Pacific Northwest.

small purple flowers

Images and information about bloom time, habitat, and distribution range for more than 2,700 plant species that grow wild in Washington.

Photo of fireweed in bloom

Images, species descriptions, range maps and bloom period for more than 850 common wildflowers, shrubs and vines that occur in Washington.

sketches of Centaurea plants

We’re revising Flora of the Pacific Northwest, published in 1973, with updated information for over 5,300 varieties of vascular plants.

Cortinarius parkeri, a common spring species in conifer forest.

Developing “barcodes” with fungi DNA helps easily identify species. 

pressed specimens

The WTU Herbarium's total holdings number more than 650,000 specimens of vascular and nonvascular plants, fungi, lichens and marine algae.

washington state map showing localities of plant specimens in WTU database

A map of Washington state showing all vascular plant specimen localities in the Herbarium WTU collections database.

yellow-orange flowers

Explore the complete checklist of the vascular plants of Washington state.

Map view of San Juan Islands

A tool for mapping the distributions of vascular plant species in the San Juan Islands.

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