Flora of North America species comparison

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

sharply trigonous, sides concave distally, 0.4–1.5 m × 1.5–5 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.

4–7, nearly equaling culm;

sheath fronts delicately pinnate-fibrillose;

blades 3–6, erect, the distal mostly longer than sheath, 1–2 mm, wide, proximally thickly V-shaped central region trigonous-channeled to laterally flattened, apically asymmetically laterally flattened-trigonous;

apex often markedly eccentric, glabrous, smooth or angles papillose.

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

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

capitate or 1 spikelet;

proximal bract erect, resembling leaf blade, 3–20 cm.

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.

1–4, 7–18 × 3–5 mm;

scales straw-colored to orange-brown or central region greenish, ovate-lanceolate, 4–5 × 2.5 mm, margins entire, smooth or awn sparsely spinulose, sometimes distally ciliolate at 40X, apex acute, mucronate, mucro 0.2–0.5 mm.

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

anthers 3–3.5 mm;

styles 3-fid.

perianth members 6, brown, bristlelike, equaling to slightly exceeding achene, spinulose;

anthers 2–3 mm;

styles 3-fid.

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

beak 0.7–2 mm.

brown, compressed trigonous, ovoid to obovoid, 3.5–4.5 × 1.7–2 mm;

beak 0.5–1 mm.

= 70.