Agave filifera

Agave filifera (thread-bearing) is a species of Agave.

Background
Flower greenish, about 2in. long; pedicels very short and stout, in a dense spike 2ft. to 3ft. long; scape 3ft. to 4ft. long, its bract-leaves subulate, the lower ones ascending, the upper squarrose. leaves sixty to a hundred in a dense rosette, stiff, straight, ensiform, 6in. to 9in. long, 1in. broad at the middle,  gradually narrowing to a grey pungent tip; face flat, the continuous grey edge splitting off copiously into irregular spreading  grey wiry threads; outer leaves of the rosette not all recurved, but spreading stiffly. Mexico.

Varieties/Subspecies
A. f. filamentosa (thready). A form with larger leaves and scape; including the spike, 10ft. to 12ft. high. A well-known, handsome variety.