Woolly-pod locoweed

Common Name
Wooly-pod locoweed
Scientific Name
Astragalus purshii
Scientific Pronunciation
ass-TRA-gal-uss PUR-shee-eye
Plant Family
Plant Origin
Plant Type
Typical Bloom (varies by elevation)
Additional Common Names
Wooly-pod milk-vetch, Pursh's milk-vetch

This low-growing, cushion-like plant has white, pink, or purple flowers that mature and produce distinctive white woolly seed pods. The stems are only two to four inches long. The leaves are the gray-green color of sagebrush. Like all legumes, locoweed helps to fix nitrogen in the soil.


The name, locoweed, derives from the Spanish word for “crazy”. It refers to the effect most plants in this family have when a large quantity of the plant is consumed over a period of several days—an otherwise calm animal can become aggressive, run around with an odd gait, run into objects with its head held low, and finally, keel over dead. Crazy is an apt description. Livestock never recover completely from the poisoning. However, woolly-pod locoweed is a preferred food source for sage grouse, which eat the leaves and seeds.


Native Americans mashed and boiled the plant in water to use as a head and body wash to stimulate circulation.