Flora of North America species comparison

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

grooved, terete, 5–45 cm, smooth.

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 1.5–8 × 0.3–0.4 mm, much shorter than 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 3–9-flowered, 3.3–7 × 1.2–3 mm;

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

scales yellow-brown, apex obtuse.

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

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

anthers 1.1–1.6 mm.

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

anthers 1.5–2.6 mm.

plano-convex, 1.2–1.6 × 0.5–0.8 mm.

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

= 58.

= 104.