Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

densely tufted, central or lateral, ascending or slightly decumbent, 45–62 cm × 0.5–1 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 tan or light brown;

sheaths green, sometimes glaucous, 4–88 mm;

blades green, sometimes glaucous, midrib and 2 lateral veins developed, flat or slightly corrugate, 30–46 cm × 3–14 mm, blades of overwintering leaves smooth or, rarely, sparsely papillose abaxially.

0.6–14 cm × 0.8–6 mm, bract blades of distal lateral spikes linear, narrower than spikes, 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 spikes 0–5 cm, arising from proximal 1/3 of culms, 1.4–3.3(–5.3) times as long as spikes they subtend; of terminal spikes 0.4–12 cm.

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

3(–4) per culm;

lateral spikes 22–62 × 3–5 mm;

distal lateral spikes separate;

terminal spike linear to linear-clavate, 22–32(–36) × 2–3 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.

6–18 per spike, scattered to loosely overlapping, ratio of longer lateral spike length to perigynia number 1.9–3.4, ascending, finely, conspicuously (22–)25–32-veined, elongate, (3.4–)3.9–5.1 × 1.2–2 mm;

beak straight or slightly curved, 0.6–1.7 mm.

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

elongate-obovoid, 2.2–2.8(–4.6) × 1–1.8 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 3.4–5 × 1.2–2.2 mm, apex aristate, apiculate, or acute.

scales oblong-ovate, 3–5 × 1.2–2 mm, margins hyaline or, occasionally, light brown, apex obtuse or acute.

3–3.2 mm.

= 68, 70.

= 36, 40.