Flora of North America species comparison

(24–)35–85 cm.

trigonous, angles obtuse, 4–35 cm, scabrous distally.

sheath adaxially white-hyaline, summits U-shaped to rounded;

distal ligules 2–3 mm;

blades (1–)2–4(–5) per fertile culm, flat ± to tip, 7–22 cm × (1.5–)2–3.5(–4) mm.

basal;

sheath fronts with apex concave to V-shaped, glabrous;

blades 7–25 cm × 1.5–3 mm, shorter than culm.

stiffly erect, usually open, brown, 1.5–4 cm × 10–15 mm;

proximal internode (2.5–)4–10 mm; 2d internode (2.5–)3–6 mm;

proximal bracts scalelike or bristlelike, shorter than inflorescences.

2–4 cm;

proximal bracts to 5 × 1 mm;

spikes crowded;

lateral spikes 0.5–1.5 cm × 4–5 mm;

terminal spikes 1–2 cm × 4 mm.

5–9, usually loosely aggregated, ovoid to broadly ovoid, 9–14 × 6–8 mm, base attenuate, apex rounded to tapered.

ascending to ascending-spreading, gold to light brown, conspicuously 3–9-veined abaxially, conspicuously 2–5-veined adaxially, lanceolate to ovate, usually flat except over achene, 3.4–4.7(–5.2) × 1.3–2.1 mm, 0.4–0.5 mm thick, margin flat, including wing 0.2–0.6 mm wide;

beak red-brown or gold at tip, usually cylindric, unwinged, ± entire for 0.3–0.5 mm, sometimes flat, ciliate-serrulate to tip, abaxial suture often with conspicuous white margin, distance from beak tip to achene (1.2–)1.5–2 mm.

yellow-brown, often red-brown at apex, sides convex, 2.5–2.8 × 1.5 mm, hairs purple-brown (hair-base bulbous);

beak red-brown, conic, thickened.

elliptic to broadly ovate, 1.1–1.8 × 0.9–1.2 mm, 0.4–0.5 mm thick.

brown, sessile, mitrate, obovoid, 2–2.2 mm.

scales reddish gold to brown or greenish, often white-hyaline at tip or base, with pale or green midstripe, narrowly to broadly ovate, 3.4–5 mm, length and width less or greater than perigynia, margin not white-hyaline, apex acute to acuminate.

brown with yellow-brown midrib, 3-veined, equaling perigynia, apex acuminate to retuse, with scabrous awn to 2 mm.

2–3 mm.

= 62, 64, 66, 68.

= 58, 62, 64, 66, 68 (Europe, Japan).