Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

to 60 cm × 1.5 mm, scabrous.

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 usually all with blades;

proximal 2–3 sheaths to 10–15 cm with reduced blades shorter than sheath, green, fronts herbaceous, prominently veined, not splitting, apex truncate, fronts of distal sheaths hyaline, rugose, indistinctly linearly veined, apex colorless, hyaline, convex, entire;

ligules obtuse, 1.5 mm, free limb to 0.1 mm;

blades not clustered at base, not epistomic, to 40 cm × 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.

very condensed, ovoid or shortly cylindric, with 5–10 indistinguishable branches, to 2.5 × 1.5 cm;

proximal internode not visible, not more than 3 mm;

proximal bract scalelike, inconspicuous.

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

pale brown, 9–11-veined abaxially, 5–7-veined adaxially, to 3.5 × 1.5 mm, base distended only slightly proximally, cordate;

stipe to 0.2 mm;

beak to 2 mm, margins serrulate, apex bidentate, teeth to 0.1 mm.

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

obovate, to 1.5 × 1 mm;

stalk to 0.2 mm;

persistent style base cylindric.

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.

hyaline, brown, distinctly shorter than perigynia.

= 68, 70.