Welcome to the Portland State University Herbarium!

Founded in 1959, the Portland State University Herbarium (HPSU) currently contains about 29,000 specimens of vascular plants, mosses, and lichens, and is the second-largest herbarium in Oregon. It consists of a core of 3,600 historical specimens collected between 1862 and 1920, with the remainder collected since 1959 by PSU faculty, students, agency botanists, consultants, and private individuals. The Herbarium is a regional resource focused on the changing flora of the rapidly urbanizing Portland-Vancouver metro area, the Columbia River Gorge, and the lower Columbia River region. Specimen data from the PSU Herbarium is available on the websites of the Consortium of Pacific Northwest Herbaria  the Oregon Flora Project, and iDigBio.