Panicum humboldtianum Kuntze, Rev. Gen. PI. 33:361. 1898. Perennial; culms 40-105 cm. high, erect from a decumbent almost woody base, commonly branching, the nodes bearded with ascending hairs; sheaths mostly longer than the internodes, sometimes crowded, papillose-hispid at least toward the summit; ligule 1-2 mm. long, dark brown; blades 8-18 cm. long, 6-15 mm. wide, acuminate, firm, stiffly spreading, the upper surface glabrous or nearly so, the lower surface usually pubescent, also with a few scattered long hairs, the margins prominently papillose-hispid at least toward the base; racemes mostly 2-5, rarely more, 5-10 cm. long, ascending or drooping, the rachis 2-3 mm. wide with a tuft of long hairs at the base; spikelets 3.2 mm. long, solitary or paired, elliptic, acute, the glume and sterile lemma equal, fringed with long spreading glistening white hairs; fruit about 2.8 mm. long, smooth and shining.
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