Flora of North America species comparison

lateral, erect or ascending, usually overtopping vegetative shoots, 24–54 cm × 0.7–1 mm.

(35–)40–110 cm;

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

basal sheaths purple, 7–18 mm;

blades erect or ascending, evergreen, midrib and 2 lateral veins strongly developed, 14–42 cm × 8–32 mm, older leaves often shriveling or dead at tips.

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.

spikes 3–5 per culm, scattered;

peduncle of pistillate spikes erect or spreading, rarely drooping, exserted 0–18 mm;

bracts from middle and proximal portions of culms reduced, 0.8–2 cm × 2–3.5 mm.

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.

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

(4–)9–13(–15) per spike, overlapping, finely veined, elliptic, 3.7–4.9 × 1.6–2 mm;

beak constricted.

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.

ascending from achene through entire orifice.

ovoid, 2.2–2.7 × 1.5–1.9 mm, sides flat to slightly concave at maturity, tightly fitting in perigynia.

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

spikes the proximal basal, 8–30 × 4–7 mm.; pistillate scales slightly keeled, 3.2–4.2 × 1.8–2.2 mm, midribs green, margins hyaline with purple outward, apex cuspidate to acuminate to 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.

spike 1, pedunculate, oblanceolate to linear, 8–20 × 2–3.5 mm.; staminate scales 3–6 × 1.5–2 mm, midveins green or purple, margins dark purple, apex obtuse.

scales obtuse.

3.2–4.2 mm.

(2.4–)2.8–4.2 mm.

= 50, 52.

= 76, 78.