Flora of North America species comparison

1–1.5 mm thick.

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

5–20 cm, 2–2.5 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 to 13 cm, fronts uniformly colorless or pale brown;

blades with inconspicuous median groove, not flattened, terete in cross section, 5–12 cm × 0.4–10 mm, lacking conspicuous air cavities.

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.

0.7–2 cm × 4–6 mm, staminate portion to 5 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.

veinless, stipitate, elliptic, 2.5–3.5 × 1.5 mm, tightly enclosing and distended by achene, base narrowly cuneate, apex acute;

beak erose;

rachilla shorter than fruit.

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

sessile.

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 yellow-brown medially, 1-veined, equaling perigynia in width, usually shorter, apex obtuse or acute, not inrolled, awns absent.

1.5–2 mm.

1.5–2.5 mm.

= 68, 70.