Astragalus iodanthus

Astragalus iodanthus is a species of flowering plant in the legume family, Fabaceae, known by the common names Humboldt River milkvetch[1] and violet milkvetch.[2] It is native to the western United States, where its range includes California, Idaho, Nevada, Oregon, and Utah.[2] It grows on hills and in valleys[3] in barren sandy and volcanic soils[4] in habitat such as sagebrush.[5]

Astragalus iodanthus
var. iodanthus

Apparently Secure  (NatureServe)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Genus: Astragalus
Species:
A. iodanthus
Binomial name
Astragalus iodanthus

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.[6][7]

There are two varieties of this species:

  • var. diaphanoides (snake milkvetch) has a denser coating of rough hairs, particularly along the leaf edges and midrib.[4]
  • var. iodanthus is less hairy, having rough hairs mainly in the inflorescence.[3]

References
  1. Astragalus iodanthus. USDA PLANTS.
  2. Astragalus iodanthus. NatureServe. 2012.
  3. A. iodanthus var. iodanthus. The Jepson eFlora 2013.
  4. A. iodanthus var. diaphanoides. The Jepson eFlora 2013.
  5. A. iodanthus var. iodanthus. Calflora 2013.
  6. Astragalus iodanthus. The Jepson eFlora 2013.
  7. http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=14873


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