Flora of North America species comparison

sometimes lax, (29–)50–135 cm.

10–90 cm.

sheaths adaxially usually brown or gold tinged near summits, summits U-shaped, prolonged to 4 mm beyond collar;

distal ligules 2–7.5 mm;

blades 2–4 per fertile culm, 15–35 cm × (1.8–)2–5(–9.9) mm.

blades 1–3.5 mm wide.

dense, headlike, brown to gold, 1.1–4 cm × 7–20 mm;

proximal internode 1.5–2.5 mm; 2d internode 1–2.5 mm, these 2 internodes collectively less than 1/3 as long as inflorescences;

proximal bracts usually bristlelike, occasionally leaflike, much longer than inflorescences.

3–12(–22) cm;

proximal internodes 10–60(–100) mm;

peduncles of proximal spikes to 8 cm;

proximal bracts with blades 5–140 mm, sheaths cylindric, 5–25(–35) mm, mouth 0.9–1.5 mm wide.

(4–)6–17, densely aggregated, usually individually indistinct, broadly ovoid to ovoid, 4.7–9(–12) × 3.7–7.6 mm, appearing coarse-textured, base rounded to acute, apex truncate to acute.

3–8;

lateral spikes androgynous or pistillate, rarely some entirely staminate, the proximal inclined or pendent, 5–30 × 3–7 mm;

terminal spike staminate or androgynous, 10–28 × 1.8–4 mm.

ascending, green or straw colored to light or coppery brown, conspicuously 4–9-veined abaxially, conspicuous 0–4(–9)-veined adaxially, veins thin, reaching top of achene, ovate to broadly ovate, plano-convex or biconvex, (2.6–)3.3–4(–4.6) × (1.2–)1.4–1.6(–2) mm, 0.6–0.7 mm thick, 2.1–2.7 times as long as wide, margin flat, including wing 0.1–0.3(–0.4) mm wide, ciliate-serrulate on distal body, often with metallic sheen;

beak brown or gold at tip, cylindric, unwinged, abaxial suture inconspicuous, distance from beak tip to achene 1.2–1.8 mm, ± entire for (0–)0.3–0.7 mm.

ascending, pale yellow proximally, brown or black distally, 3–9-veined, lanceolate, 3.5–5.5 × 1.1–2.4 mm, margins ciliate-serrulate distally, apex tapered, shortly setose, sometimes setae confined to veins, or subglabrous;

beak indistinct, to 0.5(–1) mm.

usually ovate to broadly ovate, (1.3–)1.5–1.9 × (0.9–)1–1.2(–1.4) mm, 0.5–0.7 mm thick.

obovoid, 1.7–2.2 × 1–1.3 mm.

scales pale green or straw colored to brown or reddish, often with green to straw colored midstripe, ovate to broadly ovate, 2.2–4.7 mm, shorter to slightly longer than perigynia, less than or equal in width, margin white, 0–0.2 mm wide, apex obtuse to awned.

scales brown to black, oblong-obovate, 3–5.8 × 1.1–2 mm, apex obtuse to acute, sometimes shortly awned.

scales brown or black with hyaline margins, oblong-ovate, 3.1–6.2 × 1–3 mm.

1.5–3 mm.