Flora of North America species comparison

15–120 cm;

vegetative culms few, inconspicuous, usually fewer than 15 leaves, not strikingly 3-ranked.

erect or ascending, 7–30 cm × 0.2–0.5 mm;

vegetative shoots taller than culms, (1.4–)1.7–3.7(–4.9) times as tall as tallest flowering culm, blades of vegetative shoots 1–3.5 times wider than bract blades.

sheaths adaxially white-hyaline, summits U-shaped or sometimes prolonged to 2 mm beyond collar and rounded, smooth;

distal ligules 2.2–3.5 mm;

blades 3–5 per fertile culm, 12–30 cm × 1.5–3.5 mm.

basal sheaths white to light brown;

nonbasal sheaths 1–4 mm;

blades erect, drooping or recurved, dark green to grayish blue-green, 11–38 cm × 3–9 mm, usually exceeding culms.

open, brown, (1.3–)2.5–5(–6.5) cm × 5–18 mm;

proximal internode (3–)6–13(–23) mm; 2d internode 2–12 mm;

proximal bracts scalelike or bristlelike, shorter than inflorescences.

spikes (3–)4 per culm, scattered;

peduncles of proximal pistillate spikes erect, 3–15 mm;

bracts dark green to glaucous, 1–10.5 cm × 1.5–4 mm, well developed, blade of distal lateral spike 5.6–17(–26) times as long as wide.

(3–)4–7, 5–7 on larger culms, distant, distinct, ovoid to ellipsoid, 7–17(–24) × 4–8(–12) mm, base attenuate or rarely rounded, apex acute to rounded;

terminal spike usually with conspicuous staminate base.

(10–)15–40(–45) per spike, ascending-spreading, green or reddish brown, veinless or faintly and irregularly 1–5-veined adaxially, orbiculate or broadly ovate, plano-convex, (2.6–)3.4–4.8(–5.2) × (2–)2.3–3.2 mm, 0.5–0.6 mm thick, 1.2–1.8 times as long as wide, nearly leathery, margin flat, including wing 0.3–0.8 mm wide, ciliate-serrulate at least distally, smooth;

beak pale green or brown at tip, flat, ± ciliate-serrulate, abaxial suture with gold or reddish brown-hyaline margin, distance from beak tip to achene 1.5–2.4 mm.

(3–)8–13 per spike, spirally overlapping, finely veined, obovoid, 2.8–4.2 × 1.4–2 mm;

beak tapering.

short, tapering from swelling just beyond attachment to achene, bent, ascending through entire orifice.

orbiculate to broadly ovate, 1.5–2.2 × 1.3–1.8 mm, 0.5–0.6 mm thick.

ellipsoid, 2.6–4 × 1.2–1.8 mm, sides flat at maturity, filling perigynia.

scales white-hyaline, tinged reddish brown, usually with whitish, pale gold, or green midstripe, broadly lanceolate to narrowly ovate, 2.6–4.3 mm, as long as to 0.7–0.9 mm shorter than perignyium beaks, narrower than perigynia, margins thin, sometimes involute, apex mostly acute.

spikes: proximal usually basal, proximal spikes on usually erect peduncles, distal sessile to very short-pedunculate, 6–12 × 3.5–6 mm, often hidden in foliage.; pistillate scales 1.5–2 × 0.8–1 mm, midribs green, margins hyaline, apex acute, proximal scales of lateral spikes subtending perigynia.

spike sessile or nearly so, (3.5–)4.5–10.2(–11.5) × 0.6–1.4(–1.6) mm, often hidden by distal bract and/or pistillate spikes.; staminate scales 2.6–3.6(–3.8) × 0.8–1 mm, midribs green, margins hyaline, apex obtuse.

1.2–1.8 mm.

= 48, 52, 56, 60, 64, 68.