Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

densely tufted, central or lateral, rarely erect, ascending, lax, or, occasionally, decumbent, slightly winged, 14–53 cm × 0.8–1 mm.

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.

basal sheaths brown or light brown;

sheaths 1–48 mm;

blades erect, ascending or lax, green, midrib well developed abaxially, lateral veins developed adaxially, flat, 14–36 cm × 1–10 mm, blades of overwintering leaves smooth abaxially.

0.9–17 cm × 1–8 mm, bract blade of distal lateral spikes linear, narrower than spikes, not concealing them (viewed from abaxial surface), widest bract blade of distalmost lateral spike 0.5–3.4 mm wide.

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.

peduncles of proximal absent; of terminal spike 0–1.7 cm.

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

4(–5) per culm;

lateral spikes scattered or distal 2 proximate, 15–18 × 3–4 mm;

terminal spike overtopping or proximate to proximal pistillate spikes, linear, 9–20 × 1.8–2.4 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.

4–18 per spike, closely overlapping, ratio of longer lateral spike length to perigynia number 0.8–1.7, aggregated, ascending, conspicuously (22–)25–32-veined, obovate to elliptic-obovate, 2.5–3.8(–4.1) × 1.3–2.2 mm, 1.5–1.9 times as long as achene bodies;

beak abruptly bent, 0.2–0.6 mm.

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

obovoid, 2.1–3.2 × 0.8–1.8 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 2.8–3 × 1.4–1.6 mm, apex apiculate to aristate, awn to 1.5 mm.

scales 1.8–3.2 × 1.4–1.8 mm, margins hyaline, apex acute or acuminate.

1.8–2.2 mm.

= 68, 70.

= 30, 32, 34, 36.