Welcome to Intermountain Regional Herbarium Network

The Intermountain Region is basically the region between the Sierra Nevada and the Rocky Mountains but the precise interpretation of the phrase varies. Most agree that the hydrologic Great Basin, the area with no external drainage, dominates the region. This basin is divided by north-south trending
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mountain ranges that are separated by wide valleys. The mountain ranges support woods and forests that are now essentially isolated from each other as well as from the Sierra Nevada and Rocky Mountains by the intervening valleys. The regionís biota is determined in large part by its variable and scant precipitation, most of which falls in winter, and its large fluctuations in temperature, both daily and seasonal.

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