Flora of North America species comparison

20–90 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

dark maroon at base; flowering stems 35–75 cm, longer than leaves at maturity, 0.5–0.8 mm thick, glabrous or minutely scabrous on angles, especially within inflorescence.

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 maroon, bladeless, glabrousl;

others grading from maroon to green on back, pale hyaline on front;

blades flat, 1–3 mm wide, glabrous on adaxial surface, often strigose on abaxial surface, margins and midribs of abaxial surface scabrous at distal end.

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.

peduncles of lateral spikess 20–60 mm, glabrous;

peduncle of ternimal spike 40–60 mm, glabrous or minutely scabrous on angles;

proximal bracts much shorter than inflorescence;

sheaths 15–25 mm;

blades 1.5–2.2 mm wide.

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.

green, at least body maturing to yellow, 2-ribbed but not obviously otherwise veined, except sometimes near base, tightly enveloping achene, lance-ellipsoid, 5–6.5 × 0.8–1.8 mm, cartilaginous, base with stipe 0.5 mm, apex tapering gradually to beak, short-pubescent;

beak oblique to minutely toothed, 2.5 mm.

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

stipitate, 1.8–2.5 × 0.7–1 mm, stipe adnate to thickened perigynium base, breaking from achene at maturity.

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 pale hyaline, often partially suffused with chestnut brown, with narrow green midrib, lanceolate to oblong, shorter than mature pergiynia, apex cuspidate or acuminate with serrulate green awn 1–3 mm, glabrous.

spikes 2–5, pistillate with fewer than 10 perigynia attached 3–15 mm apart, 1 spike per node, well separated, erect or drooping, linear, 5–30 × 3–5 mm;

distal spikes sometimes staminate and shorter than terminal spike.

spike staminate, 11–30 × 1.5–3 mm.

= 68, 70.

= 32.