Flora of North America species comparison

typically (3–)5–9 per clump, 25–85(–150) cm;

vegetative culms inconspicuous, usually fewer than 10 leaves clustered at apex, not strikingly 3-ranked.

dark maroon at base; flowering stems 25–100 cm, as long as leaves at maturity or often longer, 0.5–1 mm thick, glabrous but scabrous within inflorescence.

sheaths with adaxial hyaline area, not mottled abaxially, frequently puckered or cross-corrugated, summits truncate or U-shaped, rarely slightly V-shaped, at most shortly prolonged beyond collar, papillose (at 30X);

distal ligules 1.5–3.5 mm;

blades 2–4 per fertile culm, 10–28(–40) cm × 2–4 mm.

basal sheaths maroon, bladeless, glabrous or rarely minutely pubescent;

others grading from maroon to green on back, pale brown-hyaline or reddish brown on front, often red dotted, sometimes finely pubescent;

blades flat, 2–7 mm wide, glabrous on both surfaces, margins and abaxial midribs often finely scabrous.

erect, compact on tallest culms, dense, brown, 1.2–2.5(–3.5) cm × 8–12(–15) mm;

proximal internode 1.5–6(–10) mm; 2d internode 2–3.5 mm.

peduncles of lateral spikes slender, to 50 mm, usually shorter than spikes or only slightly longer, scabrous; of terminal spike 15–50 mm, finely scabrous;

proximal bracts longer, or more often, shorter than inflorescences;

sheaths 1–7 cm;

blades 1–3.5 mm wide.

4–11, ± overlapping, ellipsoid or globose, 5.5–10 × 3.6–6.5 mm, base usually acute, apex rounded to broadly acute;

proximal bracts scalelike, often with bristle tips shorter than inflorescences.

spreading to ascending-spreading, tan to brown at maturity, contrasting with scales while maturing, conspicuously at least 4–8-veined abaxially, 3–7-veined adaxially, broadly ovate, plano-convex, 3.5–4.5(–4.7) × (1.4–)1.6–2.4 mm, 0.45–0.6 mm thick, margin flat, including wing 0.25–0.45 mm wide, smooth;

beak golden to dark brown tinged at tip, flat, ciliate-serrulate, abaxial suture with golden to dark brown hyaline margin, distance from beak tip to achene 1.7–2.3 mm.

green to olive-green, usually red dotted, prominently 2-ribbed, finely 12–20-veined, loosely enveloping achene, fusiform to lance-ovoid, 5–9.5 × 1.1–2.2 mm, membranous, base acute, apex tapering gradually to abruptly contracted beak, glabrous or short-pubescent;

beak bidentate 0.7–2 mm, including teeth to 1 mm.

ovate to broadly elliptic, 1.3–1.6 × 0.9–1.2 mm, 0.4–0.55 mm thick.

stipitate, 1.9–2.5 × 1–1.5 mm, stipe 0.5–1.5 mm.

scales reddish brown or dark brown, ovate to lanceolate, 2.4–3.5 mm, at least slightly shorter than perigynium beaks, narrower than perigynia, apex acute or somewhat obtuse.

scales white-hyaline, sometimes tinged with pale brown or suffused with chestnut, with broad green midrib, finely red dotted, oblong, 2.8–6 mm, much shorter than mature perigynia, apex obtuse, acute or cuspidate, awn to 0.2 mm, glabrous, distal margin ciliate.

= 36+IV.

spikes 2–5, 1 per node, well separated, erect at anthesis, soon nodding, pistillate with 10–25 perigynia attached 2–9 mm apart, linear, 25–80 × 2–3 mm.

spike staminate or sometimes gynecandrous with a few pistillate flowers distally; 15–50 × 0.6–1.2 mm.