Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

30–100 cm;

vegetative culms few, inconspicuous, usually fewer than 12 leaves, not strikingly 3-ranked.

sheaths white-hyaline or green-veined, sometimes papillose, summits U-shaped, not distally expanded;

distal ligules 2.2–6 mm;

blades 3–4 per fertile culm, 11–25 cm × 1.7–4.2 mm.

sheath summits with adaxial hyaline band, truncate to rounded, sometimes prolonged beyond collar;

distal ligules to 5 mm;

blades 3–5 per fertile culm, 13–40 cm × 2.5–5 mm.

mostly dense, brown, 1.1–3 cm × 5–14 mm;

proximal internode 1–4 mm; 2d internode 1.4–3.4 mm;

proximal bracts scalelike, with bristle tips shorter than inflorescences.

densely to usually open, at least proximally, silvery white, 2.5–6 cm × 10–25 mm;

proximal internode (4–)8–11 mm; 2d internode 4–8 mm;

proximal bracts bristlelike to 5 cm.

3–10, usually overlapping, ovoid to globose, 4–10 × 3–7 mm, base rounded or truncate, apex rounded.

2–4(–5), distant, distinct, ovoid to globose-ovoid, 11–18 × 8–13 mm, base attenuate on terminal spike, rounded on lateral spikes, apex rounded.

ascending to ascending-spreading, light to dark reddish brown, conspicuously 3+-veined abaxially, faintly or basally 1–3-veined adaxially, winged to base, ovate or elliptic, plano-convex, 2.5–3.8 × (1–)1.2–2 mm, 0.35–0.45 mm thick, 1.9–2.5 times as long as wide, margin flat, including wing 0.2–0.5 mm wide, 1b ciliate-serrulate at least distally;

beak reddish brown at tip, flat, ± ciliate-serrulate, abaxial suture with reddish brown-hyaline margin, distance from beak tip to achene 1.2–2.2 mm.

15–80 in larger spikes, ascending, white with light green margins, veinless over achene on each face, orbiculate or little wider than long, flat, 5.5–8(–8.7) × 3.5–6.3 mm, 0.4–0.5 mm thick, margin flat, including wing 1–2 mm wide, smooth;

beak pale brown to reddish at tip, flat, (1.4–)1.6–2.5(–3.4) mm, ciliate-serrulate, abaxial suture inconspicuous or brown, distance from beak tip to achene 2.5–4 mm.

ovate or elliptic, 1–1.3 × 0.6–0.9 mm, 0.3–0.4 mm thick.

oblong-elliptic, 2.5–3 × 1.5–2 mm, 0.4–0.5 mm thick.

scales reddish brown, usually with green or whitish to brown midstripe, lanceolate, 2.5–3.5 mm, shorter and narrower than perigynia, apex acuminate or acute.

scales white-hyaline with light brown 1–3-veined midstripe, lanceolate to ovate, 4–6 mm, as long as and narrower than perignyia.

acuminate with subulate tip or awnlike, awn of at least proximate staminate scales and sometimes proximal pistillate scales 0.1–0.9(–2.4) mm, scabrous.

= 30+III.

= 68, 70.

= 64, 66.