Flora of North America species comparison

often arching to decumbent, cylindric, ridged when dry, 0.09–0.65 m × 0.5–1.5 mm.

3–4, 1(–2) cauline;

sheath fronts not pinnate-fibrillose;

blades 1–2, proximally thickly C-shaped in cross section, distally flat, rudimentary to longer than sheath, 1–200 × 0.2–1 mm, smooth or margins distally spinulose.

capitate or of 1 spikelet or with 1 or 2 branches to 15 mm;

proximal bract erect, like leaf blades, 5–15 cm.

achenes blackish brown, nearly equilaterally sharply trigonous, ovoid to obovoid, 1.3–1.8 × 1–1.4 mm, with 10–20 mostly sharp ridges;

beak 0.1 mm.

perianth absent;

anthers 0.3–0.5 mm;

styles 3-fid.

achenes trigonous, 2.2–3 mm including stout, tapered beak 0.3 mm, with many obscure to evident horizontal ridges.

= 50.