Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

30–100 cm;

vegetative culms with numerous leaves spaced evenly along distal 1/2.

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 green-veined nearly to collar, with V-shaped hyaline band extending 4–20 mm proximal to collar;

somewhat loose, expanded near summit, ± wing-angled, adaxially firm, summits truncate to U-shaped, prolonged beyond collar;

distal ligules 4–10 mm;

blades 4–6 per fertile culm, 13–40 cm × 3–7.5 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.

dense or proximally open, brown, 2–4(–4.5) cm × 8–15 mm;

proximal internode 2–6 mm; 2d internode 2–4 mm;

proximal bracts scalelike with bristle tip to 1(–8) cm.

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

6–15, usually widely spaced, globose, 4–8 × 4–8 mm, base rounded to tapered, apex rounded.

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, with beak and distal body of perigynium spreading or recurrent at 80º angle or greater, pale green to pale brown, conspicuously 3–6-veined abaxially, conspicuously 2–6-veined adaxially, ovate to elliptic, plano-convex, 2–3.5 times as long as wide, 2.7–4 × 1–1.7 mm, 0.3–0.4 mm thick, margin flat, including wing 0.1–0.2 mm wide, abruptly narrowed proximally, not extending to base;

beak tip usually not colored, flat, ciliate-serrulate, distance from beak tip to achene 1.5–1.8 mm.

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

oblong-ovate, 1.2–1.5 × 0.6–0.8 mm, 0.3–0.4 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 white-hyaline or pale brown with green to brown midstripe not reaching tip, lanceolate, 1.6–2.3 mm, 1/2 length of and narrower than perigynia, hidden by perignyium beaks, apex acute or ultimate apex often rounded to retuse.

= 68, 70.

= 70.