SafePlants

Astragalus cremnophylax: Sentry Milkvetch

Astragalus cremnophylax is a rare and fascinating plant found in a very specific location. This page provides information about its classification, distribution, and conservation.

Considerations for Pets and Children

• This plant is a forb/herb (a non-woody plant that is not a grass)

Taxonomy and Nomenclature

• Scientific Name: Astragalus cremnophylax Barneby
• Common Names: Sentry Milkvetch, Cliff Milkvetch
• Family: Fabaceae
• Varieties:
  • Astragalus cremnophylax var. cremnophylax Barneby
  • Astragalus cremnophylax var. hevronii Barneby
  • Astragalus cremnophylax var. myriorrhaphis
• Synonyms: Marble Canyon Milkvetch, Hevron's Milkvetch (for A. c. var. hevronii)

Distribution and Habitat

• Endemic to Arizona, specifically the North and South Rims of the Grand Canyon.
• Grows in rock-hugging sites overlooking the Grand Canyon.

Ecological Role

• The text mentions that the sentry milkvetch is the only endangered plant in the Grand Canyon.

Morphological Characteristics and Growth Habits

• It is a small blooming plant.
• Described as a forb/herb (a non-woody plant that is not a grass).
• Can be grown in the garden year-round, though young plants may need light protection from wind or cold in winter.

Conservation Status

• Listed as an endangered species.
• Recovery plans have been developed and implemented by the U.S. Fish and Wildlife Service.
• Efforts to bolster populations began in 2009 with a greenhouse.

Quirky Facts

• Its scientific name is derived from its habitat and means 'gorge'.
• It is sometimes referred to as the "Watchman of the Gorge."

Further Information

• U.S. Fish & Wildlife Service: Sentry Milk-vetch Recovery Plan (September 2006)
• U.S. Fish & Wildlife Service: Facts about the Sentry Milk-Vetch
• Grand Canyon National Park: Endangered Sentry Milk-Vetch Habitat Model
• Discover Life: Information on Astragalus cremnophylax