Family: Agave (Agavaceae)
Size: White, waxy, bell-shaped with 6 pointed sepals, to 1.5 in. long, in short-stalked upright cluster.
Other names: Spanish dagger, mountain yucca, Spanish bayonet, hoary yucca
Notes: The leaves are bluish-green with reddish edges with no threadlike fibers or teeth, but sharp pointed. 9 species of Yucca in Arizona.
This plant is found on the Appleton-Whittell Research Ranch Working Check list of flora.
Schott's Yucca plant profile on the USDA Plants server.