Flora of North America species comparison

25–60(–85) cm;

vegetative culms with few leaves clustered at apex.

to 60 cm × 1.5 mm, scabrous.

sheaths adaxially white-hyaline, summits U-shaped;

distal ligules 1.5–6 mm;

blades (2–)3–4(–5) per fertile culm, 7–22 cm × 2–4 mm.

sheaths usually all with blades;

proximal 2–3 sheaths to 10–15 cm with reduced blades shorter than sheath, green, fronts herbaceous, prominently veined, not splitting, apex truncate, fronts of distal sheaths hyaline, rugose, indistinctly linearly veined, apex colorless, hyaline, convex, entire;

ligules obtuse, 1.5 mm, free limb to 0.1 mm;

blades not clustered at base, not epistomic, to 40 cm × 5 mm.

erect, usually dense, green, gold, or dark brown, 1.8–3 cm8–14 mm;

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

proximal bracts bristlelike, shorter than or equaling inflorescences.

very condensed, ovoid or shortly cylindric, with 5–10 indistinguishable branches, to 2.5 × 1.5 cm;

proximal internode not visible, not more than 3 mm;

proximal bract scalelike, inconspicuous.

6–14, distant, distinct, ovoid to broadly ovoid, 8–10 × 4.5–6.5 mm, base and apex acute to truncate.

ascending, white to gold or light brown, 0–5-veined abaxially, 0–4-veined adaxially, narrowly lanceolate to narrowly ovate, flat except over achene or, occasionally, plano-convex, 3.4–4.1(–4.7) × 0.9–1.3 mm, 0.15–0.35 mm thick, margin flat, including wing 0.1–0.2 mm wide, usually crinkled distally;

beak brown or red-brown at tip, flat, ± ciliate-serrulate, abaxial suture inconspicuous, distance from beak tip to achene (1.8–)2.1–3 mm.

pale brown, 9–11-veined abaxially, 5–7-veined adaxially, to 3.5 × 1.5 mm, base distended only slightly proximally, cordate;

stipe to 0.2 mm;

beak to 2 mm, margins serrulate, apex bidentate, teeth to 0.1 mm.

± elliptic, 1.1–1.5 × 0.6–0.8 mm, 0.15–0.35 mm thick;

style usually persistent, sinuate.

obovate, to 1.5 × 1 mm;

stalk to 0.2 mm;

persistent style base cylindric.

scales gold to dark brown, with whitish, green, or brown midstripe, lanceolate, 3–3.8 mm, shorter and narrower than perigynia, apex acuminate to short-awned.

hyaline, brown, distinctly shorter than perigynia.

= 52, ca. 66, 70.