Culms in small tufts or solitary, 6–15 dm; sheaths smooth to scabrous or hairy; lvs 8–15 mm wide; spikes ± erect, 5–12 cm, open, the internodes of the flexuous, 2-edged rachis 4–10 mm; spikelets (1)2(–4) per node, soon becoming horizontally spreading, disarticulating above the glumes (if any) and between the florets; glumes wanting, or unequal and filiform-setaceous, to 16 mm; lemmas glabrous or hairy, linear, involute, rounded on the back, 5-veined distally, 8–11 mm, gradually tapering into a rough, straight awn 1–4 cm; paleas 8–10 mm, obtuse or truncate; 2n=28. Woods; N.S. and Que. to N.D., s. to Va. and Okla. (Hystrix patula)
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