Flora of North America species comparison

trigonous, 10–40 cm, scabrous proximal to inflorescence.

grooved, terete, 5–14 cm, smooth.

basal sheaths brown;

distal leaf sheaths concave at mouth;

blades 10–400 × 0.8–2 mm, equaling or exceeding culms at flowering and fruiting.

basal sheaths brown;

distal leaf sheaths truncate to concave at mouth;

blades 2–8.4 × 0.4–0.5 mm, much shorter than culms at flowering and fruiting.

spikelets 3–8-flowered, 4.1–5.2 × 1.5–2.1 mm;

bracts equaling spikelets, 3.7–6 mm, apex awned, awn to 3 mm.

spikelets 3–6-flowered, 3–4.6 × 1.7–2.8 mm;

bracts shorter than spikelets, 1.6–2.5 mm, apex mucronate.

scales orange-brown to dark brown, midribs excurrent, apex mucronate.

scales brown, apex obtuse.

perianth bristles 3–6, brown, terete, nearly equaling achenes, scabrous;

anthers 1–1.5 mm.

perianth bristles absent;

anthers 0.8–1.5 mm.

compressed trigonous, 1.5–2 × 0.7–1.1 mm.

compressed trigonous to plano-convex, (1.2–)1.4–1.9 × 0.8–1.2 mm.