Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

erect or ascending, 7–52 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 white or light brown;

nonbasal sheaths green, 8–37 mm;

blades green, 8–44 cm × 0.8–5 mm, shorter than or overtopping culm, 0.5–1.3(–1.8) times as tall as tallest flowering culm;

blades of vegetative shoots 1–3.5 times wider than bract blades.

2.2–11.4 cm × 1–3 mm.

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.

spikes (2–)4 per culm, scattered;

peduncles of pistillate spikes 0.5–10.2 cm; of staminate spike 0.4–8.7 cm.

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.

3–9 per spike, finely veined, obovoid, 2–4.2 × 1.2–1.8 mm;

beak tapering.

slender, ascending through entire orifice.

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

obovoid, 1.8–2.8 × 1–1.6 mm, sides plane or slightly concave at maturity, tightly fitting perigynia.

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.

spikes: proximal usually basal, erect, ascending, or drooping, short to long pedunclulate, 6–18 × 4–5 mm.; pistillate scales keeled, 1.8–2 × 1–1.2 mm, midribs green, margins hyaline, apex acute, proximal scales of lateral spikes subtending perigyinia.

spike 1, linear to linear-clavate, 11–24 × (1–)1.2–2.7 mm.; staminate scales oblong, 2–3.6(–5.5) × 1–1.5 mm, midribs green, margins hyaline, frequently brown tinged, apex acute.

2–3.3 mm.

= 68, 70.