Flora of North America species comparison

short or inconspicuous.

15–120 cm;

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

in dense tufts, 13–70(–100) cm.

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.

not green, usually glaucous, cauline blades 2–27 cm × 1.2–5.3 mm.

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.

(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.

(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.

olive to yellowish green or at age yellowish brown, elliptic- or oblong-ovoid to obovoid, 2.2–3.1(–3.7) × 1.2–1.8(–2) mm, 1.4–2.2(–2.4) times as long as thick;

beak 0.1–0.3 mm, orifice nearly entire.

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

1.8–2.3 × 1–1.4 mm.

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 ovate or ovateoblong, 1.4–2.5(–2.9) × 0.8–1.4 mm.

peduncle of terminal spike 0.1–3.5 cm;

bracts (middle and distal ones) overtopping spikes;

ligule of proximal bract (2–)3–17.5(–26) mm;

longest bract blade (per plant) of distal lateral spike 4.1–15.8 cm.

spikes usually arising from distal 1/2 of culms, 6–27(–32) × 3–6 mm.

spike 6–35(–43) mm, shorter than to barely exceeding and overlapping distal lateral spike.

scales with apex acute to acuminate or cuspidate.

1.6–2.9 mm.

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

= 36, 38, 40, 42.