Flora of North America species comparison

reddish brown to dark maroon at base; flowering stems 20–70 cm, much longer than leaves at maturity, 1–1.7 mm thick, glabrous or sparsely pilose.

purple-red to 4.8–8.1 cm at base, 24–53 cm;

vegetative shoots 28–49 cm, 0.5–1.3 times as tall as culms.

basal sheaths reddish brown, bladeless, pilose;

others grading from dark red to green on back, tan-hyaline on front, reddish brown dotted and usually pubescent at apex;

blades flat, 3–12 mm wide, usually pilose, more densely so abaxially, margins ciliate.

green, widest blades 2.1–4 mm wide.

peduncles of lateral spikes, when present, less than 10 mm, often pubescent;

proximal bracts usually shorter than inflorescence;

sheaths 5–50 mm;

blades 1.2–2 mm wide.

13–38 cm, 0.77–0.96 of culm height;

internode between proximalmost scales in proximalmost spike 1.7–2.9 mm;

internode between distal lateral spikes (1.6–)3.4–15.2 cm, longest internode between distal lateral spikes (5.3–)8.8–15.2 cm;

longest peduncle per plant of terminal lateral spikes (2.2–)5.1–10.4 cm;

proximal bract sheaths tight, hyaline band of sheath front with apex usually truncate or concave, occasionally convex, elongated to 2.2(–5) mm beyond apex;

ligules 4–4.9(–9.6) mm;

blades uniformly green, bract blade of distalmost lateral spike slightly exceeding or exceeded by terminal spike, longest bract blade of distalmost lateral spike 3.9–11 cm.

4–5, usually separate or the distal 2(–3) overlapping;

lateral spikes pistillate, with 3–12 perigynia, longest per plant with 6–12, 5–21 × 3.2–4.1 mm, ratio of longest lateral spike (in mm) to flower number = 1.8–2.1;

terminal spike 16–32 × 1.9–2.5 mm, longest per plant 17–36 mm, exceeding distalmost lateral spike.

pale green, blotched with dark maroon at base, dark maroon-brown distally, 2-ribbed and finely veined with to 20 veins, most conspicuous near base, loosely enveloping achene, ellipsoid, 3.7–5.3 × 1–2.2 mm, membranous, base acute, apex narrowing to beak, body covered with long, appressed to spreading hairs;

beak bidentate, 1 mm.

distichously imbricate, prominently 53–64-veined, narrowly obovate or narrowly oblong in outline, 3.8–4.9 × 1.4–1.7 mm, (2.4–) 2.5–3.1 times as long as wide, 1.7–2 times as long as achene bodies, base gradually tapered, apex gradually tapered;

beak absent or straight, 0–0.4 mm, 0–11% of perigynium length.

substipitate, 2–2.6 × 1.2–1.7 mm.

2.6–3.5 × 1.3–1.6 mm, tightly enveloped by perigynia, base abruptly contracted, apex abruptly contracted;

stipe 0.2–0.6 mm;

body 2.1–2.7 mm;

beak straight, 0.1–0.4(–1.5) mm.

spikes 2–5, 1 per node, usually crowded toward apex and overlapping staminate spike, erect, sessile or pedunculate, pistillate with 20–40 perigynia attached less than 1 mm apart, cylindric, 12–40 × 4–11 mm.

spike staminate, rarely gynecandrous, sessile or very short-pedunculate, 8–30 × 2–5.5 mm.

scales reddish brown with narrow white-hyaline margins and green midrib, broadly ovate, shorter than mature perigynia, apex obtuse to short-cuspidate, often pubescent on midrib and awn, ciliate distally.

scales 3–4.6 × 1.6–2 mm, body 1.6–2.6 mm, midrib prolonged as awn 1.1–2.5 mm.

scales 4.3–5 × 1.4–1.8 mm, apex usually acute, occasionally obtuse, awnless.

= 50, 52.