Agave lophantha

Agave lophantha (crest-flowered) is a species of Agave.

Background
Flower greenish, arranged in a dense spike 4ft. to 5ft. long; scape 7ft. to 8ft long, its leaves brown, the lower ones 6in. long. leaves thirty to forty in a rosette, rigid, ensiform, 2ft. to 3ft. long, 1 1/2in. broad at the middle, rather concave  down the face, rounded on the back, not marked with any lines, dull green; terminal spine 1in. long; margins bordered by a very  narrow continuous grey hoary line, furnished with distant linear falcate teeth, about 1 1/2in. long, sessile. Mexico.

Varieties/Subspecies
A. l. cœrulescens (bluish). leaves with a decided glaucous bloom.

A. l. longifolia (long-leaved). A mere variety of above species.