Agave Poselgerii

Agave Poselgerii (Poselger's) is a species of Agave.

Background
Flower purplish, rather more than 1in. long; scape, including the spike, 6ft. to 10ft. leaves twenty to thirty in a dense rosette, rigid, ensiform, 1ft. to 1 1/2ft, long, 1 1/2in. to 2in. broad at the middle, dull green, with a broad pale band down to  the face, rounded and marked with numerous distinct green lines  down the back; margin furnished with a continuous straight, moderately broad edge; torminal spine 1in. long, brown, pungent; side prickles moderately close, lanceolate, hooked, 1/6in. long. Trunk, 4in. to 6in. long. Texas.