Flora of North America species comparison

15–38 cm.

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

sheath summits white-hyaline, green ribbed, U-shaped, occasionally prolonged to 4 mm distal to collar;

distal ligules 1–3(–3.5) mm;

blades 2–4 per fertile culm, 4.5–18 cm × 1.5–2.5 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.

nodding, dense, dark or medium brown, 1–1.2 cm × 5.5–10 mm;

proximal internode 1.3–3 mm; 2d internode 0.6–1.5 mm;

proximal bracts scalelike to bristlelike.

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

3–6, usually individually indistinct, ovoid to broadly ovoid, 4.5–6.5 × 2.5–5.5 mm, base and apex acute to rounded;

terminal spike without conspicuous staminate base.

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-spreading to spreading, gold to dark brown, conspicuously 0–7-veined abaxially, conspicuously 0–4-veined adaxially, ovate, plano-convex, 2.6–3.2 × 0.9–1.3 mm, 0.5–0.65 mm thick, margin unwinged, pithlike tissue usually present in proximal perigynia walls;

beak medium or dark brown at tip, often with white-hyaline, cylindric to somewhat flat, abaxial suture with conspicuous white margin, distance from beak tip to achene 1.2–1.6 mm, entire.

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 to obovate, 1.2–1.5 × 0.8–1 mm, 0.4–0.5 mm thick.

obovoid, 2.1–3.2 × 0.8–1.8 mm.

scales dark brown, usually with pale or green midstripe, ovate, 1.5–2.5(–3.5) mm, usually shorter, narrower than perigynia, margin occasionally hyaline gold, to 0.4 mm wide, apex obtuse 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.

= 64

= 30, 32, 34, 36.