Flora of North America species comparison

15–120 cm;

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

(11–)15–55 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 summits U-shaped or rounded, occasionally prolonged to 2.5 mm beyond collar;

distal ligules 0.5–2.5 mm;

blades 3–5 per fertile culm, 5–18 cm × (1.1–)1.5–2.6(–3.1) 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.

dense or loosely aggregated, gold to medium brown or occasionally dark brown, 1.1–2.4 cm × 6.3–14 mm;

proximal internode (1.5–)2.5–9.5 mm; 2d internode 1–3 mm;

proximal bracts bristlelike.

(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.

4–9, individually distinct or indistinct, usually ovoid, (4.5–)6–10 × (2–)4–6 mm, base usually acute, apex rounded to acute.

(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 to ascending-spreading, straw colored to light brown with green distal margins, conspicuously 0–5-veined abaxially, conspicuously 0–4-veined adaxially, at most 1 vein reaching top of achene, lance-ovate to ovate, plano-convex or flat, usually constricted near base when dry, 2.1–3.6 × 0.8–1.4 mm, 0.4–0.5 mm thick, margin flat, 0.05–0.15(–0.2) mm wide, entire, not usually extending to distal body and beak;

beak gold to dark brown at tip, cylindric, unwinged, abaxial suture conspicuously white-margined, or occasionally inconspicuous, distance from beak tip to achene 1–1.6 mm, entire for at least 0.4 mm.

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

elliptic to quadrate, 1.1–1.4 × 0.7–1 mm, 0.3–0.5 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 gold to dark brown, with whitish to green midstripe, ovate, 1.9–3.5 mm, shorter or slightly longer than perigynia and ± equal in width, margin white, 0–0.2(–0.4) mm wide, apex obtuse to acute.

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

= 82.