Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

yellow-brown at base, 10–50 cm.

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.

sheaths glabrous;

blades glaucous, widest blades 6.1–12.3 mm wide, smooth abaxially.

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.

0.71–0.93 of culm height, rarely all spikes separate, peduncles of lateral spikes smooth, 0.4–11 cm;

peduncles of terminal spikes 1.5–37(–62) mm, usually overlapping or shorter than distal lateral spike;

proximal bract sheath loose, abaxially glabrous, sheath front slightly convex, elongated 0.2–2.2 mm beyond apex;

ligules (3–)5.2–10.2 mm;

distal bract slightly shorter than to much exceeding terminal spike.

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

(3–)4–6, usually distal 2–3 overlapping;

lateral spikes pistillate, longest ones with 11–25(–28) perigynia, 8–32 × 3.3–6.1(–6.8) mm, ratio of spike length (in mm) to flower number = (0.97–)1–1.3(–1.6);

terminal spikes 6–32 × 1.8–3.3 mm.

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.

spirally imbricate, 42–56-veined, unwrinkled, narrowly ovoid, (3.7–)3.9–4.5(–4.7) × 1.5–2.2 mm, (1.9–)2.1–2.6(–2.8) times as long as wide, obtusely triangular in cross section, dull, base gradually tapered, apex gradually tapered;

beak absent or straight, 0–0.2(–0.4) mm.

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

obovoid, 2.6–3.1 × (1.3–)1.4–1.6 mm, 0.5–0.63 times as long as perigynia, loosely enveloped by perigynia;

stipe straight, 0.1–0.3(–0.5) mm;

beak bent (0–)30–90°, (0.1–)0.2–0.4(–0.5) mm.

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 1.9–3.2(–4.5) × 1.3–2.2 mm, margins pale ferrugineous to whitish, entire, apex with awn 0.1–0.9(–1.9) mm.

scales (3.9–)4.5–5.3 × 1.6–2 mm.

1.6–2.6 mm.

= 68, 70.