Flora of North America species comparison

dark maroon at base; flowering stems 0.5–1.1 mm thick, 20–90 cm, much longer than leaves at maturity, glabrous, but often scabrous within inflorescence.

yellow-brown at base, 10–50 cm.

sheaths glabrous or short-pubescent, basal few bladeless and maroon, others grading from maroon to green on back, pale brown-hyaline, red dotted and sometimes pubescent near apex;

blades flat, 3–9 mm wide, glabrous, minutely scabrous on margins distally.

sheaths glabrous;

blades glaucous, widest blades 6.1–12.3 mm wide, smooth abaxially.

peduncles of lateral spikes slender, to 40 mm, equaling spikes or usually somewhat shorter, scabrous;

peduncle of terminal spike to 13 mm, glabrous or scabrous;

proximal bracts shorter than inflorescences;

sheaths 20–25 mm;

blades 3–4 mm wide.

0.71–0.93 of culm height, rarely all spikes separate, peduncles of lateral spikes smooth, 0.4–11 cm;

peduncles of terminal spikes 1.5–37(–62) mm, usually overlapping or shorter than distal lateral spike;

proximal bract sheath loose, abaxially glabrous, sheath front slightly convex, elongated 0.2–2.2 mm beyond apex;

ligules (3–)5.2–10.2 mm;

distal bract slightly shorter than to much exceeding terminal spike.

(3–)4–6, usually distal 2–3 overlapping;

lateral spikes pistillate, longest ones with 11–25(–28) perigynia, 8–32 × 3.3–6.1(–6.8) mm, ratio of spike length (in mm) to flower number = (0.97–)1–1.3(–1.6);

terminal spikes 6–32 × 1.8–3.3 mm.

green, usually red dotted, 2-ribbed and finely 8–12-veined, veins more obvious near base, ellipsoid to oblong-ovoid, loosely enveloping achenes, 2–3.7 × 1.3–1.6 mm, membranous, acute at base, tapering gradually to acute beakless apex, glabrous.

spirally imbricate, 42–56-veined, unwrinkled, narrowly ovoid, (3.7–)3.9–4.5(–4.7) × 1.5–2.2 mm, (1.9–)2.1–2.6(–2.8) times as long as wide, obtusely triangular in cross section, dull, base gradually tapered, apex gradually tapered;

beak absent or straight, 0–0.2(–0.4) mm.

substipitate, 1.2–2.6 × 1–1.2 mm.

obovoid, 2.6–3.1 × (1.3–)1.4–1.6 mm, 0.5–0.63 times as long as perigynia, loosely enveloped by perigynia;

stipe straight, 0.1–0.3(–0.5) mm;

beak bent (0–)30–90°, (0.1–)0.2–0.4(–0.5) mm.

spikes 2–5, 1 per node, well separated, drooping at maturity, pistillate with 10–45 perigynia attached 2 mm apart, linear, 10–70 × 2–3.5 mm.

spike gynecandrous, 10–60 × 1–3 mm.

scales white-hyaline tinged with chestnut, broad green midrib often red dotted, sometimes scabrous, ovate to oblong, shorter than mature perigynia, apex rounded or cuspidate with ciliate awn less than 1 mm, otherwise glabrous.

scales 1.9–3.2(–4.5) × 1.3–2.2 mm, margins pale ferrugineous to whitish, entire, apex with awn 0.1–0.9(–1.9) mm.

scales (3.9–)4.5–5.3 × 1.6–2 mm.

1.6–2.6 mm.

= 50, 52, 54.