Flora of North America species comparison

20–91 cm.

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 adaxially white-hyaline, sometimes gold tinged near summit, summit U-shaped or zigzag to rounded, prolonged to 3 mm beyond collar;

distal ligules 1.5–4 mm;

blades 3–4 per fertile culm, to 7–30 cm × 1.6–3.9 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.

dense or open, gold to brown, occasionally beaded, 1.7–4.8 cm × 6–16(–23) mm;

proximal internode 3.5–7.5 mm; 2d internode 2–5.5 mm, these 2 internodes collectively more than 1/3 as long as inflorescences;

proximal bracts usually bristlelike, shorter than inflorescences.

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.

(3–)5–12, distant, loosely aggregated, ovoid to broadly ovoid, 6–14.5 × 2.5–9.2 mm, base rounded to attenuate, apex truncate, rounded, or sometimes tapered.

ascending, green or straw colored to coppery, conspicuously 6–11-veined abaxially, (0–)4–5(–8)-veined adaxially, veins reaching top of achene, lance-ovate to ovate, plano-convex or biconvex, 3.4–4.8(–5.3) × 1.1–1.6(–2.2) mm, 0.4–0.65 mm thick, margin flat, including wing 0.15–0.4 mm wide, ciliate-serrulate at least on distal body;

beak gold to brown, usually reddish, at tip, cylindric, unwinged, ± entire for 0.5–0.6 mm, abaxial suture inconspicuous or with conspicuous white margin, distance from beak tip to achene 1.5–2.5 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.

elliptic to ovate or, rarely, broadly ovate, 1.5–2 × 0.9–1.3 mm, 0.4–0.6 mm thick.

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

scales gold to brown and often reddish, with whitish or green midstripe, ovate to broadly ovate, (2.5–)3.5–4.7 mm, usually shorter than and narrower or as wide as perigynia, margin white, 0–0.2 mm wide, apex obtuse to acuminate.

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.

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.