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Laramie, WY 82071 Agreement # KAA990027December 14th, 2001
Precocious milkvetch (Astragalus proimanthus) is a narrow endemic, restricted to an area of less than 320 acres near the town of McKinnon in southwestern Sweetwater County, Wyoming. This species occurs in sparsely vegetated cushion plant/bunchgrass communities on dry, thin, rocky clay soils of benches and bluffs. Prior to 2000, Precocious milkvetch was known from one historical population (last observed in 1946) and one extant occurrence consisting of 4-5 main subpopulations. Surveys in 2000 resulted in the rediscovery of the historical population and the documentation of a new occurrence approximately 8.5 miles southeast of the nearest known colony. Based on limited sampling, these populations are currently estimated at 10,500-13,000 individuals, representing a possible decline from previous estimates of 20,000 or more plants made in 1989 and 1981. Population size and density data from long-term monitoring plots, however, suggest a more stable population trend over the last decade, de
