Abstract
In the ponderosa pine zone in northern Arizona, plants can be conveniently classified into the following life-form groupings: (1) long-lived trees and shrubs, (2) perennial tall grasses, (3) perennial midgrasses, (4) perennial short grasses, (5) perennial tall, mid-, and short forbs, (6) perennial prostrate forbs, (7) short-lived half-shrubs, and (8) annuals (Fig. 1). Life span and stature are the
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