Flora of North America species comparison

in medium- to large-sized clumps, 30–90 cm.

15–120 cm;

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

cauline, usually overtopping culms;

blades 10–40(–50) cm × 4–9 mm.

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.

with proximal spikes ± strongly separate on slender peduncles, others approximate and short-pedunculate or subsessile, narrowly oblong to cylindric, 1–4 cm × 3.5–5.6 mm;

lateral spikes, if gynecandrous, with ca. 30–140 pistillate flowers distally and (0–)1–10 staminate flowers proximally;

terminal spikes staminate proximally, 1/2–3/4 pistillate distally.

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.

(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.

olive green to brown, very broadly compressed-obovoid, sharply edged, 2–2.6 × 1.8–2.4 mm;

beak often projecting out at 90° angle.

(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.

widely oblong-obovoid, 1.5–1.8 × 1–1.3 mm, apex short-apiculate.

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

scales ovate, 1.5–3.2 mm, mostly not quite as long as 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.

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