Flora of North America species comparison

15–38 cm.

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

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.

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.

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.

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.

3–6, 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.

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.

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

circular, 1–1.5 × 1–1.5 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 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.

= 64