Flora of North America species comparison

short or inconspicuous.

in dense tufts, 13–70(–100) 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.

not green, usually glaucous, cauline blades 2–27 cm × 1.2–5.3 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.

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.

olive to yellowish green or at age yellowish brown, elliptic- or oblong-ovoid to obovoid, 2.2–3.1(–3.7) × 1.2–1.8(–2) mm, 1.4–2.2(–2.4) times as long as thick;

beak 0.1–0.3 mm, orifice nearly entire.

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.

1.8–2.3 × 1–1.4 mm.

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

peduncle of terminal spike 0.1–3.5 cm;

bracts (middle and distal ones) overtopping spikes;

ligule of proximal bract (2–)3–17.5(–26) mm;

longest bract blade (per plant) of distal lateral spike 4.1–15.8 cm.

spikes usually arising from distal 1/2 of culms, 6–27(–32) × 3–6 mm.

spike 6–35(–43) mm, shorter than to barely exceeding and overlapping distal lateral spike.

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

scales ovate or ovateoblong, 1.4–2.5(–2.9) × 0.8–1.4 mm.

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.

scales with apex acute to acuminate or cuspidate.

1.6–2.9 mm.

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.

= 36, 38, 40, 42.