Agave applanata

Agave applanata (plano-convex-leaved) is a species of Agave.

Background
Flower unknown. leaves twenty to  forty in a dense sessile rosette, reaching a couple of feet in diameter, oblong-spathulate, 8in. to 12in. long, 2in. to 3 1/2in. broad, the lower half of the face flat, the upper half concave, suddenly terminating in a pungent brown spine above 1in. long blue-green bordered with brown; prickles 1/4in. to 1/8in. long, bright brown. Mexico, 1869.