Flora of North America species comparison

to 80 cm × 4 mm, scabrous.

erect, 35–140 cm;

vegetative culms few, inconspicuous, usually fewer than 12 leaves, not strikingly 3-ranked, leaves clustered at apex.

sheaths all with blades, fronts smooth, red spotted, indistinctly linearly veined, apex hyaline, colorless, fragile, convex, entire;

ligules rounded, 5 mm, free limb to 0.5 mm;

blades dark green, not epistomic, to 60 cm × 7 mm.

sheaths usually with white intervenal areas abaxially, conspicuously green-veined adaxially nearly to collar, Y-shaped hyaline area at collar, adaxially firm, summits truncate and prolonged to 2 mm beyond collar, rounded, proximal sheath loose, smooth;

distal ligules 2–5.5 mm;

blades 3–7 per fertile culm, 20–65 cm × 2.2–6(–6.5) mm.

densely spicate, elongated, cylindric, with 8–12 branches, 2–4 × 1.5 cm;

proximal internode to 0.5 mm;

proximal bracts setaceous, apparent.

erect to arching, compact to open, green, 1.5–5 cm × 5–16 mm;

proximal internode 3.5–10(–11.5) mm; 2d internode 2–8 mm;

proximal bracts scalelike with bristle tips shorter than or equaling inflorescences.

4–10, overlapping to distinct, globose to ellipsoid, 7–13 × 4–7 mm, base rounded or occasionally tapered, apex obtuse to rounded.

pale brown, coppery distally, faintly 3–5-veined or veinless abaxially, veinless adaxially, to 4 × 1.7 mm, base not distended proximally, rounded;

stipe to 0.2 mm;

beak to 2 mm, serrulate.

15–80 on larger spikes, spreading, green distally, conspicuously 4+-veined on each face, narrowly to broadly ovate, plano-convex, 2.7–4.1 × 1.3–2.3 mm, 0.35–0.5 mm thick, margin flat, including wing 0.25–0.45 mm wide, smooth;

beak pale green at tip, flat, ciliate-serrulate, abaxial suture with conspicuous white-hyaline margin, distance from beak tip to achene 1.2–2.2 mm.

circular, 1.5 × 1.3 mm;

stalk to 0.15 mm;

persistent style base cylindric.

elliptic, 1.3–1.6 × 0.9–1.2 mm, 0.35–0.5 mm thick.

coppery with hyaline margins.

scales white-hyaline, with green midstripe, ovate, 2.1–3.3 mm, much shorter by 0.7–1.6 mm and narrower than perigynia, margins hyaline or pale, sometimes involute, apex obtuse to acute.

= 68.

= 68.