Zion Milkvetch

Astragalus zionis var. zionis, commonly known as Zion Milkvetch, is a perennial herbaceous plant native to the southwestern United States, particularly found in the Zion National Park area of Utah. This variety typically grows in rocky, well-drained soils at elevations ranging from 1,200 to 2,500 meters. The growth habit of Zion Milkvetch is characterized by a low, spreading form, with individual plants reaching heights of approximately 15 to 30 centimeters. The stems are often decumbent, allowing the plant to form dense mats that can help stabilize soil in its native habitat.

The leaves of Astragalus zionis var. zionis are pinnately compound, consisting of numerous small leaflets that give the foliage a delicate appearance. The flowers, which bloom in late spring to early summer, are arranged in clusters and exhibit a characteristic purple to lavender hue, attracting various pollinators, including bees. The fruit is a legume, typically elongated and slightly curved, containing several seeds that are dispersed upon maturation. This species plays an important ecological role in its native habitat, contributing to soil nitrogen levels through its symbiotic relationship with nitrogen-fixing bacteria. Additionally, Zion Milkvetch is adapted to arid conditions, with features such as a deep root system that allows it to access moisture from deeper soil layers, making it well-suited for survival in its dry, rocky environment.