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 (5.1–)5.7–10.8 mm wide, smooth abaxially or sparsely antrorsely scaberulous on main veins.

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.

0.56–1 of culm height;

peduncles of lateral smooth;

peduncles of terminal spikes (0.5–)1.6–15(–31) mm, barely to much exceeding lateral spikes;

proximal bract sheath loose, abaxially glabrous, sheath front apex truncate;

ligules 5.2–10 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.

3–6, distal 2–4 overlapping;

lateral spikes pistillate, longest ones with (14–)19–45(–65) perigynia, 9–32(–41) × 4.1–6.5(–7.3) mm, ratio of spike length (in mm) to flower number = (0.56–)0.67–1.1(–1.3);

terminal spikes 7–35 × (1.3–)1.5–3(–3.6) 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, 43–54-veined, unwrinkled, oblong-ovoid, obtusely triangular in cross section, 3.2–4(–4.1) × 1.5–2.5 mm, (1.5–)1.8–2.3(–2.5) times as long as wide, dull, base very gradually tapered, apex gradually tapered;

beak absent or straight, 0–0.3 mm.

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

obovoid, 2.4–3 × 1.3–1.6(–1.7) mm, 0.5–0.63 times as long as perigynia, loosely enveloped by perigynia;

stipe straight 0.05–0.3(–0.4) mm;

beak bent (0–)30–90°, 0.2–0.4 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 (1.6–)2–3.2(–3.7) × 1.5–2.2(–2.5) mm, margins whitish, entire, apex awnless or with awn to 1(–1.5) mm.

scales 4.3–5.2 × 1–1.8 mm.

1.8–3.6 mm.

= 68, 70.