Flora of North America species comparison

sometimes lax, (29–)50–135 cm.

45–100 cm;

vegetative culms few, inconspicuous, usually fewer than 15 leaves, not strikingly 3-ranked, leaves clustered at apex.

sheaths adaxially usually brown or gold tinged near summits, summits U-shaped, prolonged to 4 mm beyond collar;

distal ligules 2–7.5 mm;

blades 2–4 per fertile culm, 15–35 cm × (1.8–)2–5(–9.9) mm.

sheaths green or with white intervenal areas, often adaxially white-hyaline, summits U-shaped or prolonged to 2 mm beyond collar;

sheaths finely papillose or smooth;

distal ligules 1–3 mm;

blades 3–5 per fertile culm, 15–30 cm × 1–3.5 mm.

dense, headlike, brown to gold, 1.1–4 cm × 7–20 mm;

proximal internode 1.5–2.5 mm; 2d internode 1–2.5 mm, these 2 internodes collectively less than 1/3 as long as inflorescences;

proximal bracts usually bristlelike, occasionally leaflike, much longer than inflorescences.

arching or nodding, ± open, green to light brown, 2.5–6 cm × 4.5–11 mm;

proximal internode 3–18 mm; 2d internode 3–13 mm;

proximal bracts scalelike or with bristle tips shorter than inflorescences.

(4–)6–17, densely aggregated, usually individually indistinct, broadly ovoid to ovoid, 4.7–9(–12) × 3.7–7.6 mm, appearing coarse-textured, base rounded to acute, apex truncate to acute.

3–10, distinct, ellipsoid to globose, 6–16 × 5–6.5 mm, base acute to attenuate, apex rounded;

terminal spike with conspicuous staminate base.

ascending, green or straw colored to light or coppery brown, conspicuously 4–9-veined abaxially, conspicuous 0–4(–9)-veined adaxially, veins thin, reaching top of achene, ovate to broadly ovate, plano-convex or biconvex, (2.6–)3.3–4(–4.6) × (1.2–)1.4–1.6(–2) mm, 0.6–0.7 mm thick, 2.1–2.7 times as long as wide, margin flat, including wing 0.1–0.3(–0.4) mm wide, ciliate-serrulate on distal body, often with metallic sheen;

beak brown or gold at tip, cylindric, unwinged, abaxial suture inconspicuous, distance from beak tip to achene 1.2–1.8 mm, ± entire for (0–)0.3–0.7 mm.

(20–)25–60 in larger spikes, spreading, pale green to yellowish brown, conspicuously 5-veined or more abaxially, veinless or mostly indistinctly or basally 2–4(–6)-veined adaxially, orbiculate to elliptic, plano-convex, 2.5–4.2 × 1.5–2.3(–2.5) mm, 0.4–0.6 mm thick, nearly leathery, margin flat, including wing 0.3–0.6 mm wide, smooth;

beak green or light brown at tip, flat, ciliate-serrulate, abaxial suture with conspicuous white-hyaline margin, distance from beak tip to achene 0.8–1.7(–2) mm.

usually ovate to broadly ovate, (1.3–)1.5–1.9 × (0.9–)1–1.2(–1.4) mm, 0.5–0.7 mm thick.

ovate, 1.2–1.8 × 1–1.3 mm, 0.3–0.4 mm thick;

style sometimes abaxially-adaxially bent at base.

scales pale green or straw colored to brown or reddish, often with green to straw colored midstripe, ovate to broadly ovate, 2.2–4.7 mm, shorter to slightly longer than perigynia, less than or equal in width, margin white, 0–0.2 mm wide, apex obtuse to awned.

scales white-hyaline with white, green, or gold center, broadly lanceolate, 2.3–3.8 mm, shorter than and narrower than perigynia, apex acute.

1–2.1 mm.

= 68, 70.