Flora of North America species comparison

15–38 cm.

10–75 cm.

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.

3–5 per culm;

sheaths tight, inner band hyaline, 4–13 cm, apex concave, glabrous;

ligules 0.3–1.7 mm, rounded to obtuse;

blades plicate, 7.5–25 cm × 1.2–2.6 mm, widest leaf 1.6–2.6 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.

densely crowded distally, often with basal spikes ± separate, 0.9–4 cm;

spikes 3–8;

unisexual with pistillate and staminate spikes on different plants; pistillate plants rarely with few staminate flowers; staminate plants sometimes with few pistillate flowers scattered on spikes or, occasionally, entirely pistillate spikes mixed with entirely staminate ones in same inflorescence;

proximal 2 spikes 3.8–15.5 mm apart, lateral spikes 3–13.5 mm, similar to terminal spikes;

terminal spikes 3.5–13.7 mm, usually unisexual, pistillate spikes 5–26-flowered, 4.5–7.2 mm wide, staminate spikes 6–31-flowered, 1.2–2.6 mm wide.

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.

spreading to reflexed, castaneous to almost black, 5–12-veined abaxially, 0–10-veined adaxially, ovate to deltate, 2.1–3.8 × 1.2–2.2 mm, 1.4–2.3(–2.7) times as long as wide;

beak 0.65–1.6 mm, 0.45–0.8 length of body, setulose-serrulate, teeth whitish, 0.15–0.5 mm, soft.

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

ovate to suborbiculate, 1–1.7 × 0.9–1.3 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 ovate, 1.8–2.9 × 1–1.8 mm, apex acute.

scales ovate, 2.2–3.3 × 1.1–1.8 mm, base not clavate, apex acute.

(1–)1.2–2.2(–2.35) mm.

= 64