Flora of North America species comparison

25–120 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

10–45 cm, smooth to scabrous distally;

bases (remnants of old leaves) slightly or not at all fibrous.

sheaths conspicuously green-veined adaxially nearly to apex, narrow hyaline band or sharp Y-shaped region at collar, adaxially firm, summits U-shaped, not prolonged;

distal ligules 1.5–4.5 mm;

blades 3–5 per fertile culm, 9–25 cm × 2–3.5 mm.

blades pale to bright green, shorter to longer than culms, 0.8–2.5 mm wide, herbaceous, smooth to scabrous abaxially, papillose to scabrous adaxially.

erect, open, yellow-green to brown, 1.5–4 cm × 4–12 mm;

proximal internode 3–12 mm; 2d internode 3–9 mm;

proximal bracts scalelike, with bristle tips, shorter than inflorescences.

with both staminate and pistillate spikes;

peduncles of staminate spikes 0.4–9.9 mm;

proximal nonbasal bracts leaflike, shorter than inflorescences.

2–8, distinct, ellipsoid to globose, 5–13 × 4–6.5 mm, base acute, apex rounded; staminate portion of well-developed spikes less than 2 mm.

proximal pistillate spikes 1–4 (basal spikes 0);

cauline spikes overlapping, proximal 2 spikes usually separated by less than 7 mm, with 4–14 perigynia; staminate spikes 5–14 × 0.5–1.8 mm.

spreading, green to light brown, conspicuously 4–many-veined on each face, winged to base, obovate, flat except over achene or somewhat plano-convex, 2.6–4.5 × 1.5–2.7 mm, 0.3–0.45 mm thick, margin flat, including wing 0.4–0.7 mm wide;

beak pale brown at tip, flat, ciliate-serrulate, abaxial suture with white or brown hyaline margin, distance from beak tip to achene 1–2 mm.

pale green, veinless, ellipsoid, 2.3–3.3 × 0.8–1.2 mm, longer than wide;

beak straight, pale green, 0.6–1.1 mm, weakly ciliate-serrulate, apical teeth 0.1–0.4 mm.

oblong, 1.3–1.7 × 0.75–1 mm, 0.3–0.4 mm thick;

styles laterally sinuate.

brown, ellipsoid, acutely trigonous in cross section, 1.2–1.7 × 0.7–1.3 mm.

scales white-hyaline or brown, with green midstripe, broadly lanceolate or ovate, 2.5–3.4 mm, longer and narrower than perigynia, apex acute.

pistillate scales pale to dark reddish brown, with narrow white margins, lanceolate to ovate or obovate, 2.2–3.4 × 0.4–1.8 mm, equaling or exceeding perigynia, apex usually acuminate, sometimes acute or mucronate; staminate scales lanceolate to ovate, 2.8–6 × 0.6–1.9 mm, apex acute to acuminate.

1.5–2.7 mm.

3.

= 66.