Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

typically (3–)5–9 per clump, 25–85(–150) cm;

vegetative culms inconspicuous, usually fewer than 10 leaves clustered at apex, not strikingly 3-ranked.

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 with adaxial hyaline area, not mottled abaxially, frequently puckered or cross-corrugated, summits truncate or U-shaped, rarely slightly V-shaped, at most shortly prolonged beyond collar, papillose (at 30X);

distal ligules 1.5–3.5 mm;

blades 2–4 per fertile culm, 10–28(–40) cm × 2–4 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.

erect, compact on tallest culms, dense, brown, 1.2–2.5(–3.5) cm × 8–12(–15) mm;

proximal internode 1.5–6(–10) mm; 2d internode 2–3.5 mm.

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

4–11, ± overlapping, ellipsoid or globose, 5.5–10 × 3.6–6.5 mm, base usually acute, apex rounded to broadly acute;

proximal bracts scalelike, often with bristle tips shorter than inflorescences.

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.

spreading to ascending-spreading, tan to brown at maturity, contrasting with scales while maturing, conspicuously at least 4–8-veined abaxially, 3–7-veined adaxially, broadly ovate, plano-convex, 3.5–4.5(–4.7) × (1.4–)1.6–2.4 mm, 0.45–0.6 mm thick, margin flat, including wing 0.25–0.45 mm wide, smooth;

beak golden to dark brown tinged at tip, flat, ciliate-serrulate, abaxial suture with golden to dark brown hyaline margin, distance from beak tip to achene 1.7–2.3 mm.

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

ovate to broadly elliptic, 1.3–1.6 × 0.9–1.2 mm, 0.4–0.55 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 reddish brown or dark brown, ovate to lanceolate, 2.4–3.5 mm, at least slightly shorter than perigynium beaks, narrower than perigynia, apex acute or somewhat obtuse.

= 36+IV.

= 68, 70.