Flora of North America species comparison

15–120 cm;

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

erect, straight, bluntly trigonous, 8–40 cm, smooth to slightly scabrous-angled distally.

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.

basal sheaths dark brown;

ligules 0.4–1.7 mm;

blades flat, shorter than culms, (1.5–)2–3.5(–4) 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.

0.8–1.6 cm;

spikes ca. 5–15, indistinguishable in dense, globose to ovoid head.

(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 yellowish brown proximally, reddish brown to blackish distally and on beak, finely 5–9-veined abaxially, faintly veined or essentially veinless adaxially, flattened, not inflated, narrowly to broadly elliptic, 3.3–4.6 × 1.1–1.9 mm, membranous, shiny;

stipe 0.2–0.6 mm;

beak well defined, 0.9–1.5 mm, smooth-margined.

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 reddish brown to blackish, ± translucent, lacking whitish hyaline margins, ovate, ± equaling perigynia, apex acute to acuminate, body shiny.

1.5–2.8 mm.

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