Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

15–100 cm, 1.5–3 mm wide basally, 0.9–1.1 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, fronts hyaline, yellow-brown and thickened at mouth;

ligules to 3 mm, wider than long;

blades 2.5–4 mm at widest.

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 4–8 spikes, 1–1.5 times as long as wide, 1–2 cm × 9–14 mm;

proximal bracts not more than 2 cm;

spikes with 8–20 ascending to 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 to pale brown, weakly veined or veinless abaxially, 3–4.1 × (1.7–)2–2.6 mm, margins serrulate distally;

beak 0.8–1 mm, apical teeth 0.2–0.3 mm.

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

suborbiculate, 1.5–1.7 × 1.3–1.5 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 brownish to green-hyaline with green, 3-veined center, ovate, 2.3–3.1 × 1.2–2 mm, narrower than and as long as perigynia, apex cuspidate to short-awned.

1.1–1.7 mm.

= 68, 70.