Ctenium plumosum (Hitchc.) Swallen

Ctenium plumosum (Hitchc.) Swallen, comb. nov
Campulosus plumosus Hitchc. Contr. U. S. Nat. Herb. 17: 330. 1913.
Culms slender, tufted, erect, 70-80 cm. tall, minutely pubescent especially below the spikes and the nodes; sheaths rounded on the back, scaberulous, all but the lower ones much shorter than the internodes; ligule membranaceous, truncate, about I mm. long; blades 10-25 cm. long, 1-2 mm. wide, firm, attenuate, becoming involute, scabrous; spikes 2 or 3, digitate, flexuous, 5-10 cm. long, the scabrous rachis 1 mm. wide, ciliate; first glume 2 mm. long, acute, glandular on the keel toward the base; second glume 5 mm. long, acute, hirsute on the keel below the stout, horizontal awn, the margins glabrous; first sterile lemma 2.5 mm. long, the margins ciliate nearly to the ape., the slender awn from near the middle, about 4 mm. long; second sterile lemma 3 mm. long, the margins ciliate from below the middle, the hairs longer upward, the awn 8-10 mm. long from between two short teeth; fertile lemma 3 mm. long, the margins long-ciliate in the upper half, the awn 3 mm. long; palea about as long as the lemma; upper reduced florets 2, glabrous, awnless, the lower 2 mm. long.
Typb locality: Culiacin, Sinaloa (Brandegee). Distribution: Known only from the type locality.