Astragalus williamsii, commonly known as Williams' milk-vetch, is a species of flowering plant in the family Fabaceae. It is a perennial herb with yellow petals.
The species is native to Alaska and the Canadian Yukon, and faces no major conservation threats.
Distribution Astragalus williamsii is native to southern Alaska and Canada's Yukon territory. It is found in forests, grasslands, and inland wetlands, at elevations from .
The species grows in sand or gravel near the banks of creeks, and near aspen trees in open woodlands. It has been found growing in podzol.
The type specimen was collected near the Big Salmon River in 1899. The species was described in 1900.
Description Astragalus williamsii is a perennial herb.
The stem is high, hairless, and light green or straw-coloured. The leaves are long. The plant has nine to eleven leaflets, which are long, and wide.
The petals are yellow, with purplish ridges. The calyx is black, hairy, and grows around long. The flower stalk is long.
The fruit is long, and wide. Each fruit has around four brownish-black seeds.
Conservation Astragalus williamsii is classified as of Least Concern by the IUCN. It is common in its range, and faces no threats. NatureServe classifies the species as Apparently Secure in Canada, and Vulnerable in its Alaskan range.
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