Agave ferox

Agave ferox (fierce) is a species of Agave.

Background
Flower unknown. leaves about twenty in a rosette, oblong-spathulate, 4in. to 8in. broad; face nearly flat; except at the top, slightly glaucous green; terminal spine above 1in. long,  hard, pungent; margin slightly wavy between the large dark brown teeth, which are about 1/4in. long, and curved at the top. Mexico, 1861.