Erect perennial; culms 1-1.7 m. high, more slender than A. deppeana, glabrous, the nodes densely appressed-pubescent; sheaths mostly shorter than the internodes, papillose-hispid toward the summit or sometimes only papillose; ligule about 0.5 mm. long; blades firm, usually elongate, 5-12 mm. wide, densely hispid, or papillose only; panicles 10-30 cm. long, erect, dense, greenish-purple, the branches narrowly ascending; spikelets 3 mm. long; first glume shorter than or about as long as the sterile floret, the second a little longer, bluntly acuminate; awn of fertile floret about 2 mm. long, tightly twisted below, the twisted part about equaling the sterile floret, the terminal part stiffly spreading
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