Portland State University




Botanical Resources:

Oregon State University Herbarium (OSC)

Oregon Flora Project

Oregon Plant Atlas

Consortium of Pacific Northwest Herbaria

PLANTS National Database

Jepson Manual

4-County Cooperative Weed Management Association


The Portland State University Herbarium represents a mostly regional collection of fungi, algae, bryophytes, and vascular plants. Current collecting focuses on plants of the Columbia River Gorge, the Portland -Vancouver Metropolitan  Area and lower Columbia River Valley. Recent collecting trips have also been made to the Klamath Mountains and Great Basin. The collections include about 11,000 vascular plants, 2500 bryophytes, 200 algae, and 500 fungi. 

Important collections housed in the herbarium include:

  • Howell-Flinn vascular plant collection (Oregon, 1860-1910)

  • Flinn and Foster bryophyte collection (Oregon, 1907-1915)

  • Flora of Portland vascular plant collection (city-owned lands, 1990-present)


Herbarium specimens are used in teaching and research activities by faculty and students.  Faculty and graduate students are assigned cabinet space for housing of their research specimens. 

The herbarium is open to the public by appointment for the study of specimens. Typical users include researchers, land managers, consultants, illustrators, and the general public who use the collection as a reference for plant identification, illustration, or fieldwork.  Loans are available to institutions. 

Herbarium Use Policies

The Portland State University Herbarium is located in room 421 (4th floor), Science Building I.


Herbarium Manager:
John Christy
Oregon Biodiversity Information Center
Institute for Natural Resources, Portland State University (PSU-INR)
P.O. Box 751, Portland, OR 97207-0751

Interim Director:
Mitch Cruzan
Room 404  SB1
(503) 725-8391

Herbarium Phone:  503-725-8759