Flora of North America species comparison

25–120 cm;

vegetative culms few, inconspicuous, usually fewer than 15 leaves, not strikingly 3-ranked.

dark maroon at base; flowering stems 0.5–1.1 mm thick, 20–90 cm, much longer than leaves at maturity, glabrous, but often scabrous within inflorescence.

sheaths adaxially white-hyaline, summits U-shaped or truncate and reaching to 1.5 mm beyond collar, smooth;

distal ligules 1.5–2.8 mm;

blades 3–5 per fertile culm, 9–35 cm × 1.7–3.8 mm.

sheaths glabrous or short-pubescent, basal few bladeless and maroon, others grading from maroon to green on back, pale brown-hyaline, red dotted and sometimes pubescent near apex;

blades flat, 3–9 mm wide, glabrous, minutely scabrous on margins distally.

congested or somewhat open, green to brown, 1.4–2.7(–3.4) cm × 7–16 mm;

proximal internode 3–9 mm; 2d internode 3–8 mm;

proximal bracts scalelike, bristle tips shorter than inflorescences.

peduncles of lateral spikes slender, to 40 mm, equaling spikes or usually somewhat shorter, scabrous;

peduncle of terminal spike to 13 mm, glabrous or scabrous;

proximal bracts shorter than inflorescences;

sheaths 20–25 mm;

blades 3–4 mm wide.

2–5, distant, distinct, globose to ovoid, 10–35-flowered, 7–12 × 5–10 mm, base rounded or tapered, apex rounded;

terminal spike usually lacking conspicuous staminate base.

(10–)15–40(–45) per spike, ascending, light greenish brown to brown with pale margin, conspicuously 6-veined or more abaxially, 4–6-veined adaxially, broadly ovate to orbiculate, plano-convex, 4–5.4 × 2.4–3.4 mm, 0.5–0.6 mm thick, margin flat, including wing 0.3–0.8 mm wide, smooth;

beak pale green or brown at tip, flat, 0.7–1.6(–1.8) mm, ciliate-serrulate, abaxial suture with white or hyaline golden brown margin, distance from beak tip to achene 1.7–2.6(–2.9) mm.

green, usually red dotted, 2-ribbed and finely 8–12-veined, veins more obvious near base, ellipsoid to oblong-ovoid, loosely enveloping achenes, 2–3.7 × 1.3–1.6 mm, membranous, acute at base, tapering gradually to acute beakless apex, glabrous.

broadly ovate to orbiculate, 1.6–2 × 1.4–1.8 mm, 0.5–0.6 mm thick.

substipitate, 1.2–2.6 × 1–1.2 mm.

scales yellowish brown, lance-ovate, 2.9–4 mm, 0.7–1.7 mm shorter than perigynium or reaching base or sometimes middle of perignyium beak, margins pale, apex acute or obtuse.

scales white-hyaline tinged with chestnut, broad green midrib often red dotted, sometimes scabrous, ovate to oblong, shorter than mature perigynia, apex rounded or cuspidate with ciliate awn less than 1 mm, otherwise glabrous.

spikes 2–5, 1 per node, well separated, drooping at maturity, pistillate with 10–45 perigynia attached 2 mm apart, linear, 10–70 × 2–3.5 mm.

spike gynecandrous, 10–60 × 1–3 mm.

= 74.

= 50, 52, 54.