Agave cochlearis

Agave cochlearis (cochleate) is a species of Agave.

Background
Flower yellowish green, above 4in. long, in dense clusters. leaves forming a sessile rosette 10ft. broad oblong-spathulate, 5ft. to 6ft. long, above 1ft. broad, 5in. thick at the  base, opaque green, with a deeply excavated face; terminal  spine very stout, pungent; side prickles curved variously, middle sized, deltoid. Stems 26ft high. Mexico, previous to 1867.