SafePlants

Astragalus allochrous: Halfmoon Milkvetch

Astragalus allochrous, commonly known as halfmoon milkvetch, is a flowering plant belonging to the pea family. It is found in the western and southwestern regions of the United States.

Considerations for Pets

• This plant is commonly referred to as locoweed, so research should be undertaken before deciding to keep this plant.

Considerations for Children

• This plant is commonly referred to as locoweed, so research should be undertaken before deciding to keep this plant.

Taxonomy and Nomenclature

• Scientific Name: Astragalus allochrous A. Gray
• Common Name: Halfmoon Milkvetch
• Family: Fabaceae (Pea Family or Legume Family)
• Genus: Astragalus L.
• Synonyms:
  • Astragalus wootonii Sheldon
  • Astragalus allochrous var. playanus Isely

Distribution and Habitat

• This species is native to the western and southwestern USA.
• Specific locations mentioned include:
  • Yavapai County, Arizona
  • Salero Ranch, Santa Cruz Co., Arizona
  • East Mojave Desert (sandy flats up to 6000')

Morphological Characteristics

• Halfmoon milkvetch is described as a many-stemmed herbaceous plant.
• It is a short-lived perennial acaulescent forb, growing up to 30 cm in height.
• The leaves are compound, consisting of 11 to 19 small leaflets.
• It has numerous purple flowers when in bloom.

Traditional Uses

• The Navajo, Ramah people used the leaves ceremonially as an emetic.

Quirky Facts

• The fruits are described as greenish, bladdery, pendant, 15-24 mm long, and shaped like a half-moon.

Further Information

• Discover Life: Provides information about the biology, natural history, ecology, identification, and distribution of Astragalus allochrous.
• USDA: Referenced as a source of information (Sce: USDA).
• Dave's Garden: A community sharing tips and ideas for gardens, seeds, and plants.