Flora of North America species comparison

15–120 cm;

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

aphyllopodic, smoothly 3-angled, 8–40 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.

sheath white-hyaline adaxially, summit U-shaped, smooth;

distal ligule 0.5–4.3 mm;

blades 0–3 per culm, 12 cm × 1.2–3 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.

green or pale brown, 1.6–3 cm × 7–15 mm;

proximal internode (2–)4–8 mm, 2d internode 1.7–4 mm;

bracts appressed to ascending.

(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.

3–8, densely clustered except, often, the proximal 1–2, obovoid-oblanceoloid, 10–16 × 5–7 mm, base acute to acuminate, apex truncate.

(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.

appressed, green or gold to light brown, conspicuously 3–12-veined abaxially, 0–9-veined adaxially, wing 0.1–0.15(–0.2) mm wide, narrowly lanceolate, (4.6–)5.5–7.3 × 0.7–1.2 mm, 0.3–0.4 mm thick;

beak tip white, green, or gold, narrowly flat, distance from beak tip to achene 3–5 mm, ± ciliate-serrulate.

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

elliptic to ovate, 1–1.8 × 0.6–0.8 mm, 0.3–0.4 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 white- or gold-hyaline with green or gold midstripe, lanceolate to ovate, to 3.5–4.5 mm, shorter than or longer than perigynia.

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

= 64.