Alpine Zone Complex
Found near and above the tree line, this zone complex is narrowly represented in the Cascades and more extensively in the Rocky Mountains. Mainly comprising herbaceous plants and low shrubs, these zones contain a few trees displaying krummholz form and occupying protected habitats. Alpine heath communities of the subalpine park land extend into the alpine zones, and glaciers, permanent snow fields, and extensive areas of talus and rock cover much of the area.