Flora of North America species comparison

grooved, terete, 5–45 cm, smooth.

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

basal sheaths brown;

distal leaf sheaths concave at mouth;

blades 1.5–8 × 0.3–0.4 mm, much shorter than culms at flowering and fruiting.

basal sheaths brown;

distal leaf sheaths concave at mouth;

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

spikelets 3–9-flowered, 3.3–7 × 1.2–3 mm;

bracts equaling spikelets, 3.3–4.5 mm, apex with awn less than 1 mm.

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.

scales reddish brown to dark brown, apex mucronate to acute.

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

perianth bristles 6, brown, terete, equaling or exceeding achenes, smooth to scabrous;

anthers 1.5–2.6 mm.

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

anthers 1–1.5 mm.

compressed trigonous, 1.4–1.7 × 0.6–0.9 mm.

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

= 104.