Flora of North America species comparison

15–120 cm;

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

erect, slender, 10–15(–30) cm, rough distally.

sheaths adaxially white-hyaline, summits U-shaped or sometimes prolonged to 2 mm beyond collar and rounded, smooth;

distal ligules 2.2–3.5 mm;

blades 3–5 per fertile culm, 12–30 cm × 1.5–3.5 mm.

sheaths pale brown abaxially, persisting, inner band thin, hyaline, sometimes red tinged, truncate or shallowly concave at summit;

ligules shorter than wide;

blades pale green to gray-green, flat or slightly involute, 5–10 cm × 1–2 mm, shorter than culms.

open, brown, (1.3–)2.5–5(–6.5) cm × 5–18 mm;

proximal internode (3–)6–13(–23) mm; 2d internode 2–12 mm;

proximal bracts scalelike or bristlelike, shorter than inflorescences.

0.7–1.5 cm × 4–7 mm;

proximal bracts scalelike, occasionally bristlelike, shorter than spikes.

(3–)4–7, 5–7 on larger culms, distant, distinct, ovoid to ellipsoid, 7–17(–24) × 4–8(–12) mm, base attenuate or rarely rounded, apex acute to rounded;

terminal spike usually with conspicuous staminate base.

2–3(–4), lateral spikes gynecandrous, closely approximate or the proximal slightly separate, individually distinct, containing 3–8 perigynia, oblong-clavate, 3–6 × 3–5 mm;

terminal spike not clavate.

(10–)15–40(–45) per spike, ascending-spreading, green or reddish brown, veinless or faintly and irregularly 1–5-veined adaxially, orbiculate or broadly ovate, plano-convex, (2.6–)3.4–4.8(–5.2) × (2–)2.3–3.2 mm, 0.5–0.6 mm thick, 1.2–1.8 times as long as wide, nearly leathery, margin flat, including wing 0.3–0.8 mm wide, ciliate-serrulate at least distally, smooth;

beak pale green or brown at tip, flat, ± ciliate-serrulate, abaxial suture with gold or reddish brown-hyaline margin, distance from beak tip to achene 1.5–2.4 mm.

appressed-ascending, green-white proximally, pale brown distally, often brown in age, finely several-veined, elliptic, 2–3 × 1.25–1.5 mm, widest near middle, apex conic with weakly convex, usually entire margin, subcoriaceous;

beak indistinct.

orbiculate to broadly ovate, 1.5–2.2 × 1.3–1.8 mm, 0.5–0.6 mm thick.

red-brown, broadly obovate, 1.25–1.5 × 1 mm, dull to slightly glossy.

scales white-hyaline, tinged reddish brown, usually with whitish, pale gold, or green midstripe, broadly lanceolate to narrowly ovate, 2.6–4.3 mm, as long as to 0.7–0.9 mm shorter than perignyium beaks, narrower than perigynia, margins thin, sometimes involute, apex mostly acute.

scales red-brown with lighter center and broad white-hyaline margins oblong-ovate, subequal to perigynia, apex obtuse.

= 48, 52, 56, 60, 64, 68.

= 62, 64.