The University of Washington Herbarium (also known as WTU) is an international resource for research into the diversity, distribution and ecology of Pacific Northwest vascular plants, non-vascular plants, fungi, lichen, and algae. With over 600,000 specimens currently in the collections and between 5,000-10,000 specimens added annually, WTU is one of the largest herbaria in the region.

The Herbarium has an active loan and exchange program, and is open to the public. For information about loans or visiting WTU, contact the Collections Manager.

Recent support from the National Science Foundation's Biological Research Collections program (2003-2007) resulted in the databasing of over 120,000 Pacific Northwest vascular plant specimens, which are available through our online database.

Collections The vascular plant collections are available online. Search the vascular plant database. Vascular plant type specimens. WA lichen taxa held in WTU.   WTU Image Collection: Plants and Lichens of Washington Photographs, distribution maps, and descriptions for Washington's vascular plants and lichens.   Washington Flora Checklist A working checklist of the vascular plants of Washington State.   Maps & Lists Access WTU's online resources for Washington State, including: County species lists Species distribution maps Species lists Washington Carex Atlas

Research Recent publications, field projects, collecting forays, and updates on ongoing research.   Programs The Herbarium and its resources are used for instructional programs for both formal and informal education. It also has active volunteer and internship programs.   People Meet the Herbarium staff, faculty, researchers, and grad students. The associated academic department is UW's Biology Department.   Links Links to related resources. FAQs Frequently asked questions.