The approximately 280,000 specimens in the Intermountain Herbarium come primarily from western North America, but there are substantial holdings from other parts of the world. The average growth rate for the past five years has been slightly over 4,000 specimens per year (see graph below). 171,465 specimens are databased, 80,907 are imaged, and 67,860 are georeferenced. Warning: much of the latitude and longitude information has been obtained retroactively; we do not guarantee its accuracy.
Most specimens in the herbarium are of vascular plants, with approximately half coming from Utah and Nevada, the core states of the Intermountain Region.
The herbarium now has over 3,000 fungal specimens, nearly all of which have been databased. They come primarily from Dr. R. Fogel, an Emeritus Professor of the University of Michigan, and Michael Piep, the Assistant Curator, whose interests lie in the Macrofungi of Utah.
The lichen collection is small but growing slowly, consisting of slightly over 1,200 specimens, primarily from North America, with specimens from Wyoming, Arizona, and Utah comprising the greatest percentage. About half the specimens are duplicates of specimens collected by Nash.
The bryophyte collection is small, consisting of slightly over 2,200 specimens, occupying one cabinet. About half the specimens are duplicates of specimens collected by Flowers, author of Utah's Mosses and Hepaticae of Utah..
Among its specimens, the herbarium has 81 holotypes and 1,176 isotypes. Most of the type specimens are vascular plants, but 17 of the holotypes and several of the isotypes are of fungi and lichens.