Flora of North America species comparison

yellow-brown to dark brown at base, 15–60 cm.

18–66 cm.

sheaths hispidulous;

blades green, widest blades (3–)3.4–5.4(–6.5) mm wide, glabrous abaxially or sparsely hispidulous on midrib.

sheaths adaxially white-hyaline, often tinged brown distally, summits U-shaped or rounded, sometimes prolonged beyond collar;

distal ligules 1–3(–4.5) mm;

blades 3–6 per fertile culm, 10–30(–45) cm × 1.5–3.7(–4.9) mm.

0.19–0.48 of culm height;

peduncles of lateral spikes smooth or barely scaberulous;

peduncles of terminal spikes (4.2–)7.5–37(–43) mm, much exceeding lateral spikes;

proximal bract with sheath tight, abaxially scabrous, sheath front apex convex, elongated (0.6–)1.6–4.9(–6.6) mm beyond apex;

ligules 3.3–5 mm;

distal bract usually much exceeding terminal spike.

dense or open, brown and green, 1.2–2.2 cm × (6–)9–18 mm;

proximal internode 1–3 mm; 2d internode 1–2 mm, these 2 internodes collectively less than 1/3 as long as inflorescences;

proximal bracts bristlelike, shorter than inflorescences.

3–5, separate or distal 2–4 spikes overlapping;

lateral spikes pistillate, with 2–7 perigynia, 6–29 × 3.8–6.8 mm, ratio of spike length (in mm) to flower number = 3.5–4.8;

longest terminal spikes 14–34(–42) × 1.3–3(–3.5) mm.

4–9, distinct or densely aggregated and individually indistinct, usually ovoid to broadly ovoid, 4.4–10.8 × 2.7–8.4 mm, base and apex acute to rounded.

distichously imbricate, 52–59-veined, unwrinkled, obovoid or narrowly obovoid, obtusely triangular in cross section, (4.5–)4.6–5.6(–6.2) × 1.9–2.2(–2.3) mm, (2.1–)2.3–2.8(–3) times as long as wide, dull, base gradually tapered, apex abruptly contracted;

beak excurved, (0.5–)0.8–1.3 mm.

appressed-ascending to ascending-spreading, red-brown, coppery, or chestnut, conspicuously (5–)7–10-veined abaxially, conspicuously 3–8-veined adaxially, veins reaching top of achene, elliptic to lance-ovate, plano-convex to biconvex or, sometimes, flat around achene, (2.9–)3.6–5.4 × 1–2.1 mm, 0.4–0.5(–0.6) mm thick, margin flat, including wing usually 0.2–0.3 mm wide, often incurved adaxially, perigynia then boat-shaped, ciliate-serrulate on distal body;

beak coppery or dark brown at tip, occasionally narrowly flattened, cylindric, unwinged, usually less than 1 mm, ± entire for 0.5–0.8 mm, abaxial suture usually with conspicuous white margin, distance from beak tip to achene (1.6–)2–2.3 mm.

obovoid-ellipsoid, 3.2–3.9(–4.2) × (1.6–)1.8–2.1 mm, tightly enveloped by perigynia;

stipe bent 45–70°, 0.4–0.6 mm;

beak bent more than 90°, 0.3–0.5 mm.

narrowly compressed elliptic to ovate-quadrate, 1.2–1.8 × 0.7–1.1 mm, (0.3–)0.4–0.5 mm thick.

scales (4.1–)5.6–9.4(–11.6) × 1.6–2.6(–3.3) mm, margins whitish, denticulate, apex with awn 1.1–6.8 mm.

scales red-brown or chestnut to coppery, with green, gold, or light brown midstripe, usually ovate, 2.4–3.9 mm, shorter than perigynia, width less than or equal to perigynia, margin white, 0–0.05 mm wide, apex obtuse to acuminate.

scales 5.2–6.9 × 1.5–1.7 mm.

3.4–4.2 mm.