Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

erect, ascending, or spreading, 9–48 cm × 0.6–1 mm.

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.

basal sheaths white or very light brown;

nonbasal sheaths 7–32 mm, sheath blades 0.9–11.9 cm × 1–7 mm;

leaf blades erect, ascending, or spreading, green or glaucous, 8–36 cm × 3–12 mm;

blades of vegetative shoots 0–3.5 times wider than bract blades.

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.

spikes (3–)4(–5) per culm, scattered;

peduncles of pistillate spikes exserted 0–9 cm; of staminate spikes exserted 0–9.5 cm;

bracts 2–11.8 cm × 1.3–4.8 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.

4–9 per spike, finely veined, elliptic-ovoid, 2.5–4 × 1.5–2 mm;

beak slightly bent, tapering.

slender ascending through entire orifice.

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

obvoid to broadly ovoid, 2.2–3.2 × 1.2–1.8 mm, slightly concave at maturity, tightly fitting in perigynia.

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.

spikes: the proximal basal, scattered, drooping.; pistillate scales keeled, 2.5–3.2 × 1–1.5 mm, midribs green, margins hyaline or, occasionally, reddish brown outward, apex cuspidate to acute, awn to 1 mm, proximal scale of lateral spike sterile or subtending a staminate flower.

spike 1, linear, 8–22 × 1.2–3 mm.; staminate scales obovate, 3.5–4.5 × 1–1.2 mm, midribs green, margins hyaline or reddish brown outward, apex acute.

2–3 mm.

= 68, 70.

= 44, 46.