Flora of North America species comparison

(20–)30–100 cm, 1.5–3.5 mm wide basally, 0.7–1.2 mm wide distally.

40–110 cm;

vegetative culms inconspicuous with 9–17 leaves mostly clustered near apex of culm.

sheaths usually loose, proximal green-and-white-striped and green-and-white-mottled, with conspicous transverse veins on back, fronts white to hyaline, sometimes red dotted and transversely rugose, yellow or brown and thickened at mouth;

ligules 1–4.5 mm, shorter than to as long as wide;

widest leaf blades 3.5–5 mm wide.

sheaths abaxially green or with pale intervenal areas with scattered, horizontal green septa, adaxially hyaline band broad, smooth, summit concave to truncate, equaling to extending 2 mm beyond collar;

ligules 1.8–4.8 mm;

blades 4–6 per fertile culm, 2.5–35 cm × 1.8–4.2 mm.

with 5–10 spikes, (1.5–)2–5 cm × 8–13 mm;

proximal internodes shorter than to as long as proximal spikes;

proximal bracts to 3 cm;

spikes with 5–15 ascending to spreading perigynia.

erect to slightly arching, compact to elongated, pale brown, 2.8–5.9 cm × 6–17 mm;

proximal internode 3.5–12(–17) mm; 2d internode 3–9(–13) mm;

proximal bracts scalelike, often with bristle tips shorter than inflorescences.

(3–)4–7(–11), distinct, ovoid, 9.5–20.5 × 6–9 mm, base rounded to tapered, apex rounded.

pale green to pale brown, veinless or weakly 2–5-veined abaxially, 3.4–4.6 × 1.9–2.8 mm, body somewhat spongy, thickened at base, margins serrulate distally;

beak 0.7–1.4 mm, apical teeth 0.3–1 mm.

15–80 on larger spikes, ascending, yellowish green to brown with paler margins, conspicuously 7–11-veined abaxially, faintly (0–)2–8-veined adaxially, wings with 1–4 veins, ovate, elliptic, or ± orbiculate, plano-convex, (4.5–)4.8–6.1(–6.3) × 2.5–3.8 mm, 0.5–0.7 mm thick, herbaceous, opaque with achene not clearly visible through adaxial face of perigynium, base rounded, margin flat, including wing 0.5–1.3 mm, smooth;

beak yellowish green to pale brown, strongly flattened, (1.2–)1.5–2.1(–2.3) mm, serrulate-margined to apex, abaxial suture pale or copper-brown, distance from beak tip to achene (2–)2.3–3.3 mm.

circular to elliptic-circular, 1.8–2.1 × 1.6–1.8 mm.

ovate to elliptic, 1.8–2.4 × 1.3–1.7 mm, 0.5–0.7 mm thick, apiculum to 0.4–0.9 mm.

scales hyaline or pale brown with green, 1–3-veined center, ovate, 2.2–3.5 × 1.2–1.8 mm, body 2/3 as long to almost length of perigynia, apex acuminate to short-awned.

scales pale brown with narrow yellow-green to brown midstripe prominent to tip, lanceolate, (3.7–)4–5.2 mm, (2.6–)2.9–3.7(–4.2) times as long as wide, reaching base to middle of perigynium beak, shorter than perigynia by (0.4–)0.6–1.4(–1.6) mm, margin hyaline, apex firm and herbaceous, flat or inrolled, with subulate tip or awned.

1.5–2.5 mm.

(1.8–)2.2–3.6 mm.

scales acuminate.

= 60.