Flora of North America species comparison

15–120 cm;

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

obtusely angled, 15–30 cm, 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.

basal sheaths red-brown;

sheaths of proximal leaves glabrous, fronts colorless, veinless, apex U-shaped;

blades amphistomic, 2.5–3 mm wide, papillose on both surfaces.

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.

proximal bract longer than inflorescence, 1.5 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.

erect, condensed;

proximal 3–4 spikes pistillate, proximal spike 2.2–3 cm × 3 mm, base cuneate;

terminal spike gynecandrous.

(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.

ascending, white with red-brown spots on apical 1/2 or apical 1/2 black, veinless or indistinctly veined, stipitate, tightly enclosing achenes, thin-walled, ellipsoid, 2–2.2 × 1.2–1.5 mm, dull, base truncate, distended, apex rounded, glabrous;

stipe to 0.2 mm;

beak red-brown, 0.1 mm.

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

not constricted, dull, base adnate to perigynium.

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 red-brown or black, equaling perigynia, apex obtuse, awnless.

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

= 84.