Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

8–38 cm;

bases (remnants of old leaves) weakly to strongly fibrous.

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.

blades green, 1.5–3.5(–5) mm wide, herbaceous, smooth to scabrous abaxially, smooth to scabrous adaxially.

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.

usually with either staminate or pistillate spikes, occasionally with both;

peduncles of staminate spikes short;

proximal nonbasal bracts leaflike, dark purple to black at base, shorter than inflorescences.

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

proximal pistillate spikes 1–4 (basal spikes 0–1);

cauline spikes overlapping or somewhat separted, with 4–9 perigynia; staminate spikes 13–24 × (1.4–)2–4.1 mm.

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.

green, occasionally dark purple in age, veinless or 5-veined near base, obovoid, 3.1–3.6 × 1.5–1.8 mm;

beak slightly bent, dark purple, 0.5–1 mm, weakly ciliate-serrulate, apical teeth 0.2 mm.

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

pale to medium brown, globose, round in cross section, 1.9–2.2 × 1.4–1.8 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.

pistillate scales dark purple to black, with narrow white margins, lanceolate, 3.8–4.6 × 1.3–1.8 mm, apex acuminate; staminate scales oblanceolate, 4.6–5.6 × 1.1–1.6 mm, apex acute;

proximal staminate scales with narrow white margins 0.1–0.2 mm wide.

2.1–4 mm.

3.

= 68, 70.