Henderson’s Milkvetch

Astragalus accidens var. hendersonii, commonly known as Henderson’s Milkvetch, is a perennial herbaceous plant native to the western United States, particularly found in the mountainous regions of Nevada and California. This variety typically grows in well-drained soils at elevations ranging from 1,500 to 3,000 meters. The growth habit of Henderson’s Milkvetch is characterized by its erect to spreading form, reaching heights of approximately 30 to 60 centimeters. The plant often forms clumps or mats, contributing to its resilience in the harsh alpine environments it occupies.

The leaves of Henderson’s Milkvetch are pinnately compound, consisting of multiple leaflets that are narrow and linear, providing a distinctive appearance. The flowers, which bloom from late spring to early summer, are arranged in racemes and exhibit a typical legume structure, with a creamy-white to pale yellow coloration. Each flower is approximately 1 to 2 centimeters in length and attracts various pollinators, including bees. Following flowering, the plant produces elongated, flattened pods that contain several seeds, which are adapted for dispersal by wind or animal activity.

Ecologically, Henderson’s Milkvetch plays a significant role in its native habitat by contributing to soil stabilization and providing forage for herbivores. The plant is also a nitrogen fixer, enhancing soil fertility through its symbiotic relationship with rhizobia bacteria. This adaptation is particularly beneficial in nutrient-poor alpine soils. While specific human uses of Henderson’s Milkvetch are limited, its relatives in the Astragalus genus are known for their medicinal properties, which may suggest potential for further study in this area. Overall, Henderson’s Milkvetch exemplifies the adaptations and ecological importance of alpine flora in maintaining the health of mountainous ecosystems.