Tristachya angustifolia Hitchc.

Tristachya angustifolia Hitchc. Contr. U. S. Nat. Herb 17:328. 1913.
Culms in loose tufts with a hard knotty base, erect, slender, about 1 meter tall; foliage purplish, glabrous, the sheaths shorter than the internodes; ligule a minute ring of stiff hairs; blades flat, with an involute tip, scabrous above and on the margin, 3-4 mm. vride, the lower
elongate, the upper reduced to involute points; panicle loose, 10-15 cm. long, the slender,
flexuous axis and branches nearly smooth, the lower branches as much as 6 cm. long; spikelets
tawny, the triad, excluding the awns, about 2 cm. long; first glume 13-14 mm. long, acute,
entire or obscurely toothed; second glume 17-18 mm. long, subacute, slightly erose; sterile
lemma slightly longer than the first glume, 3-toothed and ciholate at the subhyaline apex;
fertile lemma -illous, except on the middle dorsum, about 8 mm. long, including the bearded
callus and short-acuminate teeth; awn stout, 32-35 mm. long, twisted more than half its length.
Typb locality: Santa Teresa, top of Sierra Madre, Tepic (Rose 2229). Distribution: Known only from the type collection.