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. 

Duration:  08:09 minutes
Transcript: From the brink of extinction to the path of survival: The sentry milk-vetch recovery project transcript