Flora of North America species comparison

30–140 cm.

(5–)20–80 cm.

sheaths adaxially conspicuously green-veined nearly to collar, narrow hyaline band or sharp Y-shaped region at collar, adaxially firm, sometimes papillose, summits U-shaped;

distal ligules 2.8–8 mm;

blades 3–7 per fertile culm, 11–50 cm × 2.5–6 mm.

sheath summits usually U-shaped, sometimes prolonged to 2.5(–4) mm beyond collar;

distal ligules 1–3(–5) mm;

blades 3–4(–5) per fertile culm, 10–20 cm × (1.5–)2–3(–5) mm.

dense or open, pale green or brown, 2–6.5 cm × 7–20 mm;

proximal internode 3–13 mm; 2d internode 4–10 mm;

proximal bracts scalelike with bristle tips shorter than inflorescences.

erect, dense, headlike, green to brown, (0.8–)1.5–2.2 cm × 7–20 mm;

proximal internode 1.5–5 mm; 2d internode 1–3.5 mm;

proximal 2–3 bracts leaflike, ascending to spreading, much longer than inflorescences, usually less than 1.8 mm wide, bases ± surrounding culms.

3–11, distant, distinct, ellipsoid to ovoid, 6–20 × 4–9 mm, base rounded or short-acute, apex broadly acute to obtuse.

(5–)7–10(–14), individually distinct or indistinct, broadly ovoid to ovoid, (4.5–)7–10 × 4.5–7(–9) mm, base and apex truncate to acute.

± spreading, light or golden brown, faintly 3–8-veined on each face, obovate, flat except over achene, 4–5.5 × 2.5–3.8 mm, 0.4–0.5 mm thick, margin flat, including wing 0.8–1.5 mm wide;

beak light brown at tip, flat, 0.85–2.2 mm, ciliate-serrulate, abaxial suture with light brown margin, distance from beak tip to achene 1.8–3 mm.

ascending to ascending-spreading, cream colored to light brown, conspicuously 0–9-veined abaxially, conspicuously 0–8-veined adaxially, ovate to lanceolate, plano-convex or flat, (2.8–)3.5–4(–4.8) × (0.8–)1–1.5(–1.8) mm, 0.35–0.45 mm thick, margin flat, including wing (0.1–)0.2(–0.5) mm wide, wing ciliate-serrulate on distal body;

beak gold to red-brown at tip, cylindric, unwinged, abaxial suture usually with conspicuous white margin, distance from beak tip to achene 1.9–2.5 mm, entire for at least 0.4–0.9 mm.

oblong, 1.7–2 × 0.9–1.1 mm, 0.3–0.4 mm thick.

sessile or shortly stipitate, ovate to obovate, (1–)1.2–1.6 × 0.7–1 mm, 0.3–0.4 mm thick.

scales white-hyaline or tan, with green midstripe extending to tip, lanceolate, 2.8–3.5(–3.8) mm, shorter or longer and much narrower than perigynia, apex firm, acuminate or awned to 0.8 mm.

scales gold to brown, with whitish, green, or tan midstripe, lanceolate to ovate, 2.4–4.3 mm, shorter, narrower than perigynia, margin sometimes white, 0.25 mm wide, apex acuminate to awned.

= 74.

= 68.