ⓘ Astragalus nuttallianus

                                     

ⓘ Astragalus nuttallianus

Astragalus nuttallianus is a species of milkvetch known by the common names smallflower milkvetch and turkeypeas. It is native to the southwestern and south central United States and northern Mexico, where it can be found in many types of habitat, often in dry areas.

It is an annual plant that is variable in appearance, especially on grades. It produces slender, hairy stems which reach 4 to 45 centimeters in length. The leaves are up to 6.5 centimeters long and made up of several oval, pointed or rounded leaves. The inflorescence bears 1 to 4 White to purple or bicolored flowers, each less than one centimeter in length. The fruit is a legume pod of 12 to 26 mm.

There are several varieties of this species:

  • A. n. var. nuttallianus - known from the central US from Kansas to Louisiana.
  • A. n. var. trichocarpus - native to Texas and Oklahoma.
  • A. n. var. macilentus - native to New Mexico and Texas.
  • A. n. var. zapatanus - Texas endemic.
  • A. n. var. imperfectus - native to the southwestern United States.
  • A. n. var. austrinus - distributed from California to Oklahoma to northwestern Mexico.
  • A. n. var. cedrosensis - native to the Sonoran Desert.
  • A. n. var. micranthiformis - found in the southwestern United States.