Flora of North America species comparison

densely tufted, central or lateral, ascending or slightly decumbent, 45–62 cm × 0.5–1 mm.

(35–)40–110 cm;

vegetative culms few, inconspicuous, with 6–8 leaves, not strikingly 3-ranked.

basal sheaths tan or light brown;

sheaths green, sometimes glaucous, 4–88 mm;

blades green, sometimes glaucous, midrib and 2 lateral veins developed, flat or slightly corrugate, 30–46 cm × 3–14 mm, blades of overwintering leaves smooth or, rarely, sparsely papillose abaxially.

sheaths adaxially white-hyaline, summits concave or truncate, prolonged beyond collar to 2.5 mm, papillose at least near apex;

distal ligules 1–5 mm;

blades 3–4 per fertile culm, 2.5–25 cm × 2–5 mm, usually adaxially papillose.

0.6–14 cm × 0.8–6 mm, bract blades of distal lateral spikes linear, narrower than spikes, widest bract blade of distalmost lateral spike 0.5–3.4 mm wide.

peduncles of proximal spikes 0–5 cm, arising from proximal 1/3 of culms, 1.4–3.3(–5.3) times as long as spikes they subtend; of terminal spikes 0.4–12 cm.

open, pale brown, 0.24–0.62 cm × 8–15 mm;

proximal internode 5–17 mm; 2d internode 3–10 mm;

proximal bracts scalelike, with bristle tips shorter than inflorescences.

3(–4) per culm;

lateral spikes 22–62 × 3–5 mm;

distal lateral spikes separate;

terminal spike linear to linear-clavate, 22–32(–36) × 2–3 mm.

3–6(–8), distant, distinct, ovoid to clavate, 7–21 × 5.5–12 mm, base rounded to long tapered, apex rounded.

6–18 per spike, scattered to loosely overlapping, ratio of longer lateral spike length to perigynia number 1.9–3.4, ascending, finely, conspicuously (22–)25–32-veined, elongate, (3.4–)3.9–5.1 × 1.2–2 mm;

beak straight or slightly curved, 0.6–1.7 mm.

15–80 in larger spikes, ascending or ascending-spreading, green to pale whitish green with reddish brown margin, conspicuously 8–12-veined abaxially, 4–8-veined adaxially, broadly elliptic to nearly orbiculate, (4.5–)5.1–6.7(–7.1) × (2.4–)2.8–4.2 mm, 0.5–0.7 mm thick, membranaceous with brown achene visible through hyaline adaxial face, margin flat, including wing 0.8–1.2 mm wide, often erose, scalloped, or with an irregular tooth, smooth;

beak pale brown at tip, flat, ciliate-serrulate, abaxial suture inconspicuous, distance from beak tip to achene 2.4–3.7 mm.

elongate-obovoid, 2.2–2.8(–4.6) × 1–1.8 mm.

elliptic to oblong, 1.6–2.2 × 1.1–1.6 mm, 0.5 mm thick.

scales 3.4–5 × 1.2–2.2 mm, apex aristate, apiculate, or acute.

scales reddish brown with green midstripe, lance-ovate to ovate, 3.1–5.4 mm, 1.9–3.2 times as long as wide, (1–)1.4–2.3 mm shorter than perigynia, narrower than perignyia, apex obtuse to acute.

scales oblong-ovate, 3–5 × 1.2–2 mm, margins hyaline or, occasionally, light brown, apex obtuse or acute.

scales obtuse.

3–3.2 mm.

(2.4–)2.8–4.2 mm.

= 36, 40.

= 76, 78.