Chaetochloa tenacissima Hitchc. & Chase, Contr. U. S. Nat. Herb. 18:352. 1917. Annual; culms simple to rather freely branching, erect or leaning or clambering over vegetation, 30 cm. to as much as 2 m. long, glabrous, sometimes scabrous below the panicle; sheaths compressed, keeled, more or less antrorsely scabrous or nearly glabrous, the margins sometimes ciliate toward the summit; ligule densely ciliate, about 0.5 mm. long; blades 6-20 cm. long, 4-10 mm., or sometimes 15 mm., wide, long-acuminate, firm, very scabrous, especially on the margins, and also pilose; panicles 5-15 cm. long, more or less flexuous, green or usually tinged with purple, the axis densely pubescent and sparsely pilose; bristles one below each spikelet, 5-10 mm. long, prominently retrorsely scabrous above, antrorsely below, flexuous, becoming implicate and tangled; spikelets 1.5 mm. long, usually purple; first glume half as long as the spikelet, 3-nerved, the second glume and sterile lemma equal, 5-nerved, covering the finely transversely rugose fruit.
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