Recovering the endangered Sentry Milk-Vetch in Grand Canyon National Park
Project Status: Ongoing
Standing guard over the rim of the Grand Canyon, the tiny, federally endangered "sentry" milk-vetch (Astragalus cremnophylax var. cremnophylax) is a perennial herb that forms a one inch tall by eight inch wide mat in shallow pockets of soil on the Kaibab limestone. It is endemic to the Grand Canyon, and only grows within 25 feet of the canyon rim. Since 2006, when the Sentry Milk-Vetch Recovery Plan was completed, Grand Canyon National Park has partnered with the U.S. Fish and Wildlife Service, the Arboretum at Flagstaff, and the Grand Canyon Association to reverse the decline of this species. The project involves growing plants off site to develop a seed source and planting stock, identifying and expanding suitable habitat, and continuing experimentation to optimize propagation methods and the survival of the plants in the wild.