Astragalus lentiginosus var. iodanthus, synonym Astragalus iodanthus, is a variety of Astragalus lentiginosus, a flowering plant in the legume family, Fabaceae. It is known by the common names Humboldt River milkvetchAstragalus iodanthus. USDA PLANTS. and violet milkvetch. NatureServe. 2012. It is native to the western United States, where its range includes California, Idaho, Nevada, Oregon, and Utah. It grows on hills and in valleysA. iodanthus var. iodanthus. The Jepson eFlora 2013. in barren sandy and volcanic soilsA. iodanthus var. diaphanoides. The Jepson eFlora 2013. in habitat such as sagebrush.A. iodanthus var. iodanthus. Calflora 2013.
This perennial herb produces several prostrate stems up to 40 centimeters long. The compound leaves are made up of 9 to 21 rounded or teardrop-shaped leaflets each up to 1.8 centimeters long. The inflorescence is a raceme of flowers in shades of reddish purple or white to cream with a purple tip on the keel petal. There are up to 25 flowers in a raceme, and they are crowded when first blooming but spread out over time. The fruit is a legume pod up to 4 centimeters long, becoming dark, mottled, and papery to leathery with age.Astragalus iodanthus. The Jepson eFlora 2013.
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