Flora of North America species comparison

usually aphyllopodic, without dead leaf remains at base, 20–60 cm.

brown to chestnut at base, surrounded by remains of old leaf bases, but not conspicuously fibrillose; flowering culms 30–80 mm, usually longer than leaves at maturity, 1–2 mm thick, glabrous but finely scabrous within inflorescence.

blades 1–2.5 mm wide, margins involute, scabrid.

sheaths glabrous, basal ones dark chestnut, grading to light brown and green on back, all bearing blades, sometimes very reduced in size on basal ones;

sheath fronts brown-hyaline or membranous, darker brown and often red dotted toward apex;

blades rigid, flat or channeled near base, 2.5–7 mm wide, glabrous but margins, edges of adaxial surface, and midrib of abaxial surface finely scabrous.

proximal bracts 2–6 cm, shorter than inflorescences;

lateral spikes sometimes androgynous, 6–20 × 4–8 mm, with 8–30 perigynia;

terminal spikes 7–35 × 1.5–2.5(–3) mm.

peduncles of lateral spikes slender, to 100 mm (proximal spikes) or to 30 mm (distal spikes), minutely scabrous; of terminal spike 3–20 mm, glabrous;

proximal bracts much shorter than inflorescences;

sheaths 10–75 mm;

blades 1.5–3.5 mm wide.

2.5–4 × 1.8–2.6 mm, apex rounded;

beak 0.1–0.5 mm.

green to straw colored, sparsely red dotted, 2-ribbed and finely 7–10-veined, slightly inflated around achene, ovoid, 5–6.5 × 1.5–2.5 mm, membranous, base rounded, apex gradually tapering to beak, glabrous;

beak bidentate, 2.5 mm including teeth, teeth hyaline, narrow, to 1 mm.

substipitate, 2–2.5 × 1.2–1.7 mm.

scales ovate to ovate-circular, 3–5.5 × 2–3.4 mm, wider and as long as or slightly longer than perigynia, apex obtuse to subacute, sometimes mucronate.

scales pale hyaline tinged with light brown, with midrib green to golden green, ovate to elliptic, nearly as long as mature perigynia, gradually narrowing to acuminate or short-cuspidate apex, glabrous except scabrous midrib.

scales obovate, 3–4.5 × 1.4–1.6 mm, apex obtuse, sometimes mucronate.

2–3 mm.

spikes 4–12, 1–3 per node;

proximal spikes well separated, arching, pistillate with 20–50 perigynia attached 1 mm apart, cylindric, 15–45 × 6–9 mm;

distal spikes androgynous or staminate, usually crowded near apex.

spike staminate, sometimes compound at base, 20–60 × 2.5–4 mm; the set of predominantly staminate spikes usually conspicuously raised above predominantly pistillate ones.