A member of the Agave Family. Calabanus hookeri is from the Chihuahuan Desert on the U.S. Mexico border.
Tufts of grass like leaves from a single caudex. Very rare in cultivation, however it does make an attractive specimen in a container or in the garden if you have the right climate.
Over time the cuadex can get very large, over 12 inches across is not uncommon in cultivation, and much larger in its natural habitat. It is this cuadex that many collectors grow the plant for, it is fascinating. Closely related to Nolina, another interesting group.