Flora of North America species comparison

51–97 cm.

13–50 cm, scabrous distally;

bases (remnants of old leaves) weakly to strongly fibrous.

sheaths adaxially green-veined nearly to collar, ± white-hyaline triangular area to 6 mm proximal to collar, firm, summits tinged brown, usually rounded, prolonged to 1.5–6 mm beyond collar;

distal ligules (3–)4–8 mm;

blades 3–4(–5) per fertile culm, 15–25(–45) cm × (2.5–)3–4(–5) mm.

blades green, 0.7–4.5 mm wide, herbaceous, smooth to scabrous abaxially, smooth to scabrous adaxially.

proximal branches often bearing several spikes, green to pale brown, 3.5–8 cm × 10–13 mm;

proximal internode 5–12 mm; 2d internode 4–11 mm;

proximal bracts bristlelike, shorter than inflorescences.

with both staminate and pistillate spikes;

peduncles of staminate spikes (0.8–)2.5–20 mm;

proximal cauline bracts leaflike, green or reddish brown, shorter than inflorescences.

(6–)8–12, distant, distinct, broadly ovoid, 11–18 × 6–8 mm, base attenuate, apex rounded.

proximal pistillate spikes 1–3(–4) (basal spikes 0, rarely 1);

cauline spikes overlapping or somewhat separated, with (2–)5–15 perigynia;

staminate spikes 8–30 × 1.3–4.1 mm.

ascending to ascending-spreading, white or gold conspicuously (1–)3–8-veined abaxially, conspicuously 1–7-veined adaxially, ovate to broadly ovate, flat or plano-convex, 3.2–4.2 × 1.7–2.1 mm, 0.4–0.5 mm thick, margin flat, including wing 0.3–0.5(–0.6) mm wide, ciliate-serrulate at least distally;

beak white or gold at tip, flat, ± ciliate-serrulate, abaxial suture inconspicuous or with conspicuous white margin, distance from beak tip to achene (1.5–)1.8–2.4 mm.

yellowish green to pale brown or olive, veinless, obovoid, 2.8–4.6 × 1.5–2.2 mm, as long as wide;

beak straight, pale green, occasionally with reddish tinge, 0.4–1.3 mm, weakly ciliate-serrulate, apical teeth 0.1–0.7 mm.

ovate to obovate, (1.3–)1.5–1.8 × 0.9–1.2 mm, 0.4–0.5 mm thick.

dark brown, obovoid to globose, obtusely trigonous in cross section, (1.4–)1.6–2.5 × 1.5–2.2 mm.

scales white-hyaline or pale gold, with green, gold, or brown midstripe, lanceolate to ovate, 2.7–3.5 mm, somewhat shorter and narrower than perigynia, apex obtuse or acute.

pistillate scales pale brown to dark reddish brown or purplish brown, narrow white margins, elliptic to ovate, 2.6–5.4 × 1.2–2.6 mm, equaling perigynia, apex acute to acuminate or short-awned (rarely obtuse);

staminate scales with white margins 0.4–0.8 mm wide, lanceolate to obovate, 3.6–6.7 × 1.2–1.7 mm apex obtuse to long-acuminate.

(1.5–)2–3.8 mm.

3.

= 66.