Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

10–80 cm, 1–2.4 mm wide basally, 0.5–1 mm wide distally.

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 tight, green or, sometimes, green-and-white-mottled, fronts hyaline;

ligules to 2 mm, usually longer than wide;

widest leaf blades 1.1–3(–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.

forming dense heads, with 3–8 spikes, 0.7–2 cm × 4.5–9 mm;

proximal bracts to 2 cm;

spikes with 6–10 ascending or spreading perigynia.

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

pale green, veinless or weakly veined abaxially, 2.5–3.5 × 1.5–2.1 mm, body ovate, widest at 0.25–0.4 length of body, margins smooth or serrulate distally;

beak 0.3–0.8 mm, apical teeth 0.1–0.3 mm.

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

circular, 1–1.5 × 1–1.5 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 hyaline with green midvein, ovate, 1.5–2.5 × 0.9–1.2 mm, not more than 1/2 length of perigynia, apex acute to cuspidate.

0.6–1.7 mm.

= 68, 70.