Flora of North America species comparison

20–91 cm.

obtusely or acutely angled, 25–80 cm, glabrous.

sheaths adaxially white-hyaline, sometimes gold tinged near summit, summit U-shaped or zigzag to rounded, prolonged to 3 mm beyond collar;

distal ligules 1.5–4 mm;

blades 3–4 per fertile culm, to 7–30 cm × 1.6–3.9 mm.

basal sheaths red-brown or brown;

sheaths of proximal leaves smooth, fronts lacking spots and veins, apex U-shaped;

blades usually amphistomic, 2.5–5 mm wide, papillose or glabrous.

dense or open, gold to brown, occasionally beaded, 1.7–4.8 cm × 6–16(–23) mm;

proximal internode 3.5–7.5 mm; 2d internode 2–5.5 mm, these 2 internodes collectively more than 1/3 as long as inflorescences;

proximal bracts usually bristlelike, shorter than inflorescences.

peduncle of proximal spike 0.6–2 cm;

proximal bract equal to or longer than inflorescence, 3–5 mm wide.

(3–)5–12, distant, loosely aggregated, ovoid to broadly ovoid, 6–14.5 × 2.5–9.2 mm, base rounded to attenuate, apex truncate, rounded, or sometimes tapered.

erect or the proximal pendent;

proximal 3–5 spikes pistillate, 3–5.5 cm × 2–6 mm, base cuneate or attenuate;

terminal 1–3 staminate.

ascending, green or straw colored to coppery, conspicuously 6–11-veined abaxially, (0–)4–5(–8)-veined adaxially, veins reaching top of achene, lance-ovate to ovate, plano-convex or biconvex, 3.4–4.8(–5.3) × 1.1–1.6(–2.2) mm, 0.4–0.65 mm thick, margin flat, including wing 0.15–0.4 mm wide, ciliate-serrulate at least on distal body;

beak gold to brown, usually reddish, at tip, cylindric, unwinged, ± entire for 0.5–0.6 mm, abaxial suture inconspicuous or with conspicuous white margin, distance from beak tip to achene 1.5–2.5 mm.

ascending, pale brown, 0–4-veined on each face, somewhat inflated, loosely enclosing achenes, ellipsoid, 1.9–3.1 × 1.2–2 mm, dull, base with stipe to 0.3 mm, apex acute, short-papillose;

beak slightly conic to cylindric, 0.2–0.3 × 0.2–0.3 mm, entire.

elliptic to ovate or, rarely, broadly ovate, 1.5–2 × 0.9–1.3 mm, 0.4–0.6 mm thick.

strongly constricted on 1 face, sometimes on 1 margins, apex rounded to truncate, sometimes glossy;

style base strongly bent, rarely straight.

scales gold to brown and often reddish, with whitish or green midstripe, ovate to broadly ovate, (2.5–)3.5–4.7 mm, usually shorter than and narrower or as wide as perigynia, margin white, 0–0.2 mm wide, apex obtuse to acuminate.

scales brown to reddish brown, 2.8–5.5 × 0.9–1.4 mm (including awn), narrower than perigynia, midvein reaching apex, 1/3–1/2 the width of the scale, apex acuminate, aristate, awn glabrous or scabrous.

= 73, 75, 76.