Flora of North America species comparison

0.2–10 cm, 0.6–1.2 mm in diam.

15–120 cm;

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

arising singly or in loose tufts of 2–6(–12), 10–40(–60) cm, apically slightly scabrous.

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.

proximal 1–4 reduced to bladeless or nearly bladeless sheaths;

foliage leaves 1–2(–3) per culm;

ligules about as wide as long;

blades mostly 1–3 (proximal blade) or 5–13 (distal) cm × 0.5–1.6 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.

consisting of slender terminal cone of (1–)2–4 staminate flowers and (1–)2–6(–7) pistillate flowers, 3–10 (often 5–8) × 2–8 (immature fruit) or to 17 (mature fruit) mm.

(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.

light green, becoming straw colored or pale brown, lance-subulate to narrowly elongate-oblong, (5–)5.9–7.8 × 0.7–1.1 mm, long-tapering;

beak indistinct;

rachilla vestigial.

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

2–2.4 × 0.8–1 mm;

style exserted 0.2–1.3 mm beyond orifice of beak.

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 3.7–5.9 mm, wider than and 2/3 length of perigynia.

scales closely appressed.

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

= ca. 74, 76.