Flora of North America species comparison

(24–)35–85 cm.

loosely tufted or solitary, ascending or lax, 10–32 cm × 0.8–1.6 mm.

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 sheaths light brown to brown;

sheaths green or yellow-green, 2–26 mm;

blades ascending, green or yellow-green, midrib well developed abaxially, 2 lateral veins well developed adaxially, flat, 18–44 cm × 12–14 mm, blades of owerwintering leaves smooth.

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.

peduncles of proximal spike to 6 cm, longer lateral ones 4.6–14 times as long as spikes they subtend, arising in proximal 1/3 of culm, distal lateral spikes not exserted;

peduncle of terminal spike 0–2.8 cm;

bracts 8–21 × 1–4 mm, blade of distal lateral spike linear, narrower than spikes, widest bract blade of distalmost lateral spike 0.5–3.4 mm wide.

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

3(–4) per culm;

lateral spikes 7–20 × 2.5–4.5 mm;

terminal spike 11–35 × 1.8–3 mm.

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.

6–18 per spike, closely to loosely overlapping, ratio of longer lateral spike length to perigynia number 0.8–2.4, aggregated, spreading, finely, conspicuously (22–)25–32-veined, narrowly elongate, 3–5.2 × 1.2–1.6 mm;

beak excurved, 0.4–1.7 mm.

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

elongate-obovoid, 2.2–3 × 1.2–1.6 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.

scales 2–2.5 × 0.8–1.2 mm, apex acute or mucronate.

scales 3.2–4.2 × 1–1.2 mm, margins hyaline or brown tinged, apex acute.

3.5–4 mm.

= 62, 64, 66, 68.