Flora of North America species comparison

15–120 cm;

vegetative culms few, inconspicuous, usually fewer than 15 leaves, not strikingly 3-ranked.

to 60 cm.

sheaths adaxially white-hyaline, summits U-shaped or sometimes prolonged to 2 mm beyond collar and rounded, smooth;

distal ligules 2.2–3.5 mm;

blades 3–5 per fertile culm, 12–30 cm × 1.5–3.5 mm.

blades 3–6 mm wide.

open, brown, (1.3–)2.5–5(–6.5) cm × 5–18 mm;

proximal internode (3–)6–13(–23) mm; 2d internode 2–12 mm;

proximal bracts scalelike or bristlelike, shorter than inflorescences.

longer than 15 cm, proximal internodes 100–250 mm;

peduncles of proximal spikes commonly exserted less than 1 cm;

proximal bracts with blade 40–125 mm, sheaths cylindric, 11–75 mm, mouth not purple-banded, 1.3–2.1 mm wide.

(3–)4–7, 5–7 on larger culms, distant, distinct, ovoid to ellipsoid, 7–17(–24) × 4–8(–12) mm, base attenuate or rarely rounded, apex acute to rounded;

terminal spike usually with conspicuous staminate base.

5–7;

lateral spikes androgynous or pistillate, the proximal spikes erect to pendent, 9–20 × 5–8 mm;

terminal spike staminate or androgynous, ± erect, 9–19 × 2.5–4.5 mm.

(10–)15–40(–45) per spike, ascending-spreading, green or reddish brown, veinless or faintly and irregularly 1–5-veined adaxially, orbiculate or broadly ovate, plano-convex, (2.6–)3.4–4.8(–5.2) × (2–)2.3–3.2 mm, 0.5–0.6 mm thick, 1.2–1.8 times as long as wide, nearly leathery, margin flat, including wing 0.3–0.8 mm wide, ciliate-serrulate at least distally, smooth;

beak pale green or brown at tip, flat, ± ciliate-serrulate, abaxial suture with gold or reddish brown-hyaline margin, distance from beak tip to achene 1.5–2.4 mm.

spreading, green to gold, 11–16-veined, ovate to obovate, 3.1–4.5 × 1–1.6 mm, margins often ciliate distally, glabrous;

beak distinct, 0.6–1.2 mm, apex white, ciliate, distance from beak tip to achene apex less than 1.4 mm.

orbiculate to broadly ovate, 1.5–2.2 × 1.3–1.8 mm, 0.5–0.6 mm thick.

scales white-hyaline, tinged reddish brown, usually with whitish, pale gold, or green midstripe, broadly lanceolate to narrowly ovate, 2.6–4.3 mm, as long as to 0.7–0.9 mm shorter than perignyium beaks, narrower than perigynia, margins thin, sometimes involute, apex mostly acute.

scales usually scarious with green to gold midvein, obovate to ovate, 2–4 × 1.2–2 mm, apex obtuse to acuminate or, sometimes, awned.

scales gold with pale midvein with broad scarious margins, usually obovate, 2.8–4.3 × 1–2.4 mm, apex acute to short-awned.

1.4–2.2 mm.

= 48, 52, 56, 60, 64, 68.