The W. P. Fraser Herbarium (SASK), in the Department of Plant Sciences, of the University of Saskatchewan, has collections representing vascular plants, bryophytes, and lichens. The vascular plant collection is the largest in Saskatchewan, and a major regional one in Western Canada, with presently about 160,000 accessioned specimens in the main research collection.

A primary objective of this herbarium is to provide a good taxonomic and geographical representation of all native and naturalized vascular plant species occurring in this province. The herbarium serves as a primary source of information on the diversity and distribution of the Saskatchewan flora. Specimens from outside of Saskatchewan provide important comparative materials and have educational value.

The collections contain specimens from:

• Saskatchewan
• Northwestern Canada and Alaska
• the great plains and northern mountain states
• eastern North America
• northern Europe
• some from the rest of the world

The official international code to be used when citing Fraser Herbarium specimens is "SASK" [as published in Index Herbariorum Part 1. The Herbaria of the World. IAPT, New York Botanical Garden, New York]. Index Herbariorum