Flora of North America species comparison

2–3 mm thick.

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

15–22(–30) cm, 2.5–3 mm thick at base.

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 2–3 cm, fronts often mottled dark brown;

blades flattened laterally, with 5–8 conspicuous air cavities, median groove inconspicuous, elliptic in cross section, 10–20(–25) cm × 0.6–1.2 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.

1.4–2.5 cm × 7–12 mm, staminate portion 2–10 mm.

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.

angles veined, shortly 3–10-veined on faces, sessile, broadly elliptic, 5–7 × 3–4.8 mm, base rounded, apex rounded;

beak entire;

rachilla longer than fruit.

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

stalked to 0.15 mm.

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 medially, 3–5-veined, shorter and narrower than perigynia, leathery, apex acute to acuminate;

proximal scales sometimes awned to 4 mm.

2–3 mm.

1–2 mm.

= 68, 70.