Flora of North America species comparison

15–120 cm;

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

not easily compressed, angles obtuse, to 80 cm × 2 mm, glabrous.

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.

sheaths of proximal 2–3 leaves bladeless, fronts smooth, indistinctly linearly veined, forming tubular extension distal to sheath-blade junction, apex colorless, fragile, U-shaped, entire;

ligules obtuse, 4 mm, free limb to 3 mm;

blades not epistomic, to 75 cm × 5 mm.

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.

densely spicate, elongate, with 15–20 distinguishable branches, 5–10 × 2.5 cm;

proximal internode to 10 mm.

(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.

(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.

pale brown with red-brown veins, 10–12-veined abaxially, 7-veined adaxially, to 5 × 1.7 mm, base distended proximally, cordate;

stipe to 0.2 mm;

beak to 2.5 mm, serrulate.

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

broadly ovate, 1.7 × 1.5 mm;

stalk to 0.15 mm;

persistent style base cylindric, 0.15 mm.

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.

pale brown with hyaline margins.

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