Flora of North America species comparison

20–50 cm.

50–110 cm;

vegetative culms with numerous leaves spaced evenly along distal 1/2.

sheaths adaxially white-hyaline, often cross-corrugated, summits U-shaped or rounded, sometimes prolonged to 2.5 mm beyond collar;

distal ligules 1–2.5(–3.5) mm;

blades 2–4(–7) per fertile culm, 8–25 cm × (2.5–)3–4 mm.

sheaths adaxially green-veined nearly to collar, with ± triangular white-hyaline area to 3–8 mm proximal to collar, somewhat loose, expanded near summits, ± wing-angled, adaxially firm, summits U-shaped, somewhat thickened, slightly prolonged beyond collar;

distal ligules 4–8(–12) mm;

blades 4–10 per fertile culm, 15–40 cm × (2–)3–7 mm.

dense, gold or brown, 1.3–3 cm × 12–20 mm;

proximal internode 0.5–3.9(–5) mm; 2d internode 1–3(–4) mm;

proximal bracts scalelike or bristlelike, shorter than inflorescences.

erect, dense distally, brown, 2–5(–8) cm × 10–20 mm;

proximal internode 2–20 mm; 2d internode 2–13 mm;

proximal bracts bristlelike, 1(–8) cm.

3–8, usually distinct, broadly ovoid, 9–12 × 6–9 mm, base rounded to attenuate, apex rounded.

6–15, overlapping or distinct, ovoid-oblong to globose, 6–12(–16) × 4–8 mm, base rounded to tapered, apex rounded.

ascending to spreading, green, straw colored, or occasionally white, 10–20-veined abaxially, conspicuously 0–12-veined adaxially, thin, broadly ovate, flat except over achene, 4–5.8 × 1.8–3.4 mm, 0.3–0.5(–0.6) mm thick, 1.7–2.3 times as long as wide, margin flat, including wing 0.4–1 mm wide, edge minutely crinkled and ciliate-serrulate at least distally;

beak spreading, gold, red-brown to dark brown, sometimes white-hyaline at tip, flat, ± ciliate-serrulate, sometimes cylindric, unwinged, ± entire for 0.5–0.7 mm, abaxial suture usually inconspicuous, distance from beak tip to achene 2.2–3 mm.

more than (30–)40 per spike, appressed-ascending to ascending, pale green to pale brown, 3–6-veined abaxially, conspicuously or, occasionally, faintly, 2–4-veined adaxially, often somewhat asymmetric, ovate-lanceolate to ovate-elliptic, plano-convex, 3–5.4 × 1.1–1.7 mm, 0.3–0.5 mm thick, margin flat, including wing 0.1–0.5 mm wide;

beak tip flat, ciliate-serrulate, abaxial suture with golden to dark brown hyaline margin, distance from beak tip to achene 1.4–2 mm.

elliptic to broadly obovate, (1.4–)1.7–2.4 × 1–1.6 mm, 0.3–0.5 mm thick.

oblong-ovate, 1–1.8 × 0.6–0.9 mm, 0.3–0.5 mm thick.

scales white, gold, red-brown, or coppery, with pale to green midstripe, lanceolate to ovate, 3.2–4.8 mm, shorter and narrower than perigynia, margin white, 0–0.15(–0.3) mm wide, apex acute to acuminate.

scales white-hyaline or pale silvery brown with green midstripe, lanceolate, (1.9–)2.5–3 mm, 1/2 length of and narrower than perigynia, apex acute to acuminate.

= 70.