Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

30–70(–110) cm.

sheaths white-hyaline or green-veined, sometimes papillose, summits U-shaped, not distally expanded;

distal ligules 2.2–6 mm;

blades 3–4 per fertile culm, 11–25 cm × 1.7–4.2 mm.

sheaths adaxially white-hyaline, often brownish tinged, summits U- or V-shaped, prolonged to 0–0.5(–1) mm beyond collar;

distal ligules 1.5–3 mm;

blades (2–)3–4 per fertile culm, 11–40(–50) cm × 1.4–3.5(–4) mm.

mostly dense, brown, 1.1–3 cm × 5–14 mm;

proximal internode 1–4 mm; 2d internode 1.4–3.4 mm;

proximal bracts scalelike, with bristle tips shorter than inflorescences.

open or dense, brown or gold, 1.5–3 cm × 8–12 mm;

proximal internode 2.5–7 mm; 2d internode 1.5–4.5 mm;

proximal bracts bristlelike or leaflike.

3–10, usually overlapping, ovoid to globose, 4–10 × 3–7 mm, base rounded or truncate, apex rounded.

4–8(–9), distant to loosely aggregated, at least proximal 1–3 distinct, narrowly to broadly ovoid, (8–)10–11 × 4–6.5 mm, base acute to attenuate, apex acute to truncate.

ascending to ascending-spreading, light to dark reddish brown, conspicuously 3+-veined abaxially, faintly or basally 1–3-veined adaxially, winged to base, ovate or elliptic, plano-convex, 2.5–3.8 × (1–)1.2–2 mm, 0.35–0.45 mm thick, 1.9–2.5 times as long as wide, margin flat, including wing 0.2–0.5 mm wide, 1b ciliate-serrulate at least distally;

beak reddish brown at tip, flat, ± ciliate-serrulate, abaxial suture with reddish brown-hyaline margin, distance from beak tip to achene 1.2–2.2 mm.

appressed-ascending to ascending, green or straw colored to light brown, often green distally, conspicuously 5–9-veined abaxially, conspicuously 0(–3)-veined adaxially, narrowly to sometimes broadly ovate, plano-convex or biconvex, 3.5–4.5(–5.4) × 1.5–1.9 mm, 0.6–0.7 mm thick, ± leathery, margin flat, including wing 0.15–0.3 mm wide, ciliate-serrulate at least on distal body, sometimes filled with pithlike tissue towards perigynium base, often with metallic sheen;

beak brown or gold at tip, cylindric, unwinged, abaxial suture usually inconspicuous, distance from beak tip to achene 1.5–2.2(–2.8) mm, ± entire for 0.5–1 mm.

ovate or elliptic, 1–1.3 × 0.6–0.9 mm, 0.3–0.4 mm thick.

elliptic to broadly ovate, (1.5–)1.7–2.1(–2.3) × 1.05–1.45 mm, 0.5–0.65 mm thick.

scales reddish brown, usually with green or whitish to brown midstripe, lanceolate, 2.5–3.5 mm, shorter and narrower than perigynia, apex acuminate or acute.

scales gold or red-gold to chestnut-brown, often with green, gold, or whitish midstripe, ovate to broadly ovate, 3.1–3.6(–4.2) mm, less than or equal to perigynia length, width, margin white, 0–0.2(–0.3) mm wide, apex obtuse to acuminate.

= 68, 70.