Elizabeth’s Milkvetch

Astragalus desperatus var. neeseae, commonly known as Elizabeth’s Milkvetch, is a perennial herbaceous plant native to the arid regions of the western United States, specifically found in parts of Wyoming and Colorado. This variety typically grows in rocky, well-drained soils at elevations ranging from 1,500 to 2,500 meters. The growth habit of Elizabeth’s Milkvetch is characterized by a low, spreading form, reaching heights of approximately 15 to 30 centimeters. The plant often forms dense mats, which can help stabilize soil in its native habitat.

Notable characteristics of Astragalus desperatus var. neeseae include its compound leaves, which are pinnate and consist of several leaflets that are typically lanceolate to ovate in shape. The flowers are a striking feature, appearing in clusters and exhibiting a range of colors from pale purple to white, often with a distinctive yellow or purple marking. Flowering occurs primarily in late spring to early summer, and the plant’s fruit is a legume, which is elongated and can contain multiple seeds. These fruits are crucial for the plant’s reproductive success and serve as a food source for various wildlife species.

Ecologically, Elizabeth’s Milkvetch plays a significant role in its native habitat by contributing to soil stability and providing forage for herbivores. Additionally, as a member of the legume family, it has the ability to fix nitrogen in the soil, enhancing soil fertility and supporting surrounding plant communities. This species has adapted to its environment through drought resistance mechanisms, such as deep root systems that access moisture and a waxy leaf surface that reduces water loss. These adaptations enable Astragalus desperatus var. neeseae to thrive in challenging conditions, making it an important component of its ecosystem.