Flora of North America species comparison

25–120 cm;

vegetative culms inconspicuous with few leaves clustered at apex.

10–110 cm.

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.

3–5 per culm;

sheaths tight, inner band hyaline, 3.5–24 cm, apex concave, glabrous;

ligules rounded to obtuse, 0.5–3.7 mm;

blades plicate, 8–60 cm × 0.4–4(–4.5) mm, widest leaf 0.8–4(–4.5) mm wide.

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.

0.8–5.5 cm;

spikes 2–8;

lateral spikes pistillate often with a few staminate flowers proximally, 3.1–13.1 mm, sessile, staminate portion 10-flowered, to 6.5 mm, pistillate portion 3–40-flowered, 2.5–12 mm;

basal 2 spikes 1.5–18 mm apart;

terminal spike gynecandrous, 4.8–23.7 mm, staminate portion 2–21-flowered, 1.8–13.5 × 0.8–1.3 mm, pistillate portion 4–38-flowered, 3–11 × 4.4–7.5 mm.

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.

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.

spreading to reflexed, green, 6–13-veined abaxially, (0–)1–12-veined adaxially over achene, broadly ovate to suborbicular, cuneate or concavely tapered from widest point to beak, 1.9–3.8 × (1.3–)2.1–3 mm, 1.1–1.7(–1.9) times as long as wide;

beak 0.45–1.25 mm, 0.23–0.5(–0.63) length of body, serrulate, teeth 0.15–0.45 mm.

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

styles laterally sinuate.

deltate to rhombic-orbiculate, 1–1.9 × 1–1.7 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.

scales ovate to ± suborbicular, 1.2–2.4 × 1.2–2 mm, apex obtuse to acute.

scales ovate-lanceolate to ovate, 1.3–3.5 × 0.8–1.4 mm, base clavate, apex acute to obtuse.

0.6–1.5(–1.8) mm.

= 66.