Flora of North America species comparison

acutely angled, 45–140 cm, scabrous.

15–120 cm;

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

basal sheaths red-brown or brown;

sheaths of proximal leaves bladeless, scabrous, fronts red-brown to copper-brown, spots absent, indistinctly ladder-fibrillose;

blades 12–55 cm × 4–10.5 mm.

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.

peduncle of proximal spike 0.6–6.1 cm;

proximal bract longer than inflorescence, 1.9–9.5 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.

2–5 pistillate, 1–3 staminate, pendent;

proximal pistillate spike 2.4–10.4 cm × 3–8.4 mm, base cuneate to acuminate.

(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.

ascending, pale brown, 0–5-veined abaxially, scarcely inflated, loosely enclosing achenes, ovoid to ellipsoid, 1.9–4.2 × 1.1–2.3 mm, dull, apex acute or obtuse, glabrous;

beak 0.1–0.3 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.

variously constricted.

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

scales pale brown to copper-brown, 3.1–8.2 mm (including awn), midvein reaching apex, apex of body acuminate or, rarely, truncate, awned.

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.

= 66, 68.

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