Flora of North America species comparison

proximally bluntly and distally sharply trigonous, 0.6–2 m × 3–5 mm.

subcylindric, 0.2–1.5 m × 0.5–1 mm.

5–20+, nearly equaling culm;

sheath fronts delicately pinnate-fibrillose;

blades 2–6+, smooth;

distal blade longer than sheath, 2–10 mm wide, smooth;

emergent blades stiff, cross section thickly V-shaped to trigonous near ligule, central region acutely trigonous and laterally flattened, distal region laterally flattened, apex often asymmetric; submerged blades often flaccid, ribbonlike.

3–20+, smooth;

sheath fronts sometimes delicately pinnate-fibrillose;

blades 3–20, when erect C-shaped in cross section proximally, elliptic most of length, when submerged usually flaccid and filiform to narrowly ribbonlike, probably longer than sheath, 0.2–1 mm wide.

2–3 times branched, 2–3 proximal internodes elongated, branches to 16 cm;

proximal bract erect, resembling emergent leaf blade, 7–32 cm.

a solitary, erect spikelet;

proximal bract erect, like stiff leaf blade, 7–60 mm.

3–20, 10–25 × 5–6 mm;

scales straw-colored to orange-brown or flanks red, central region usually greenish, aging brown, ovate-lanceolate, 5–7 × 3 mm, smooth, margins sometimes ciliolate at 40X, apex acute, entire, mucro to 0.2 mm.

5–15 × 3–7 mm;

scales pale brown, or central region green when young, ovate-lanceolate, 4–6 × 1.5 mm, smooth, margins sometimes ciliolate apically at 40X, midrib obscure, apex acute, entire, minutely mucronate.

perianth bristles 6, medium brown to reddish, equaling achene, sparsely spinulose;

anthers 3–3.5 mm;

styles 3-fid.

perianth members 6, brown, bristlelike, from 1/2 of to equaling achene beak, spinulose;

anthers 2–3.5 mm;

styles 3-fid.

medium brown, ovoid to obovoid, compressed-trigonous, 3–4.5 × 1.7–2 mm;

beak 0.7–2 mm.

brown, strongly trigonous, obovoid to obpyriform, (2.5–)3–3.5 × 1.5–1.7 mm;

beak 0.3–0.8 mm.

= 72.