[Wikipedia] Variety Info: he species has two named varieties. Astragalus pycnostachyus var. lanosissimus — Ventura marsh milkvetch,[2] now endemic to the Oxnard Plain in Ventura County, with only one population within Oxnard.[3] The single extant population of this rare plant variety is now fenced and protected. The variety is treated as an endangered species on the federal level.[4][3] Threats to its existence include near-total loss of habitat, infestation by weevils, cucumber mosaic virus infection, competition from non-native plants such as ice plant, and herbivory by the milk snail Otala lactea. Astragalus pycnostachyus var. pycnostachyus — marsh milk vetch, primarily found in the San Francisco Bay Area.[5] (link added by Mary Ann Machi)