Flora of North America species comparison

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

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

basal sheaths gray-brown;

distal leaf sheaths concave at mouth;

blades 6–9 × 0.4–0.5 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 15–20-flowered, 5.4–8 × 2.2–3.5 mm;

bracts equaling or shorter than spikelets, 4.5–7.8 mm, apex mucronate or awned, awn to 3 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 yellow-brown, apex obtuse.

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

perianth bristles 6, white, flattened, exceeding achenes by as much as 20 times, smooth;

anthers 1.1–1.6 mm.

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

anthers 1–1.5 mm.

plano-convex, 1.2–1.6 × 0.5–0.8 mm.

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

= 58.