Flora of North America species comparison

polystichous, mostly spreading or excurved, often exceeding culms;

sheaths entire, abaxially smooth or sparsely hirtellous;

ligule absent;

blades filiform, to 0.5 mm wide, somewhat involute, abaxially glabrous or ascending-strigillose.

polystichous, mostly spreading-excurved, to 1/2 as long as culms;

sheaths usually entire;

ligule absent;

blades linear, 2–3 mm wide, flat or shallowly involute, margin scabrid, apex blunt.

terminal;

spikelets sessile or subsessile in single capitate leafy-involucrate cluster;

scapes filiform;

involucral bracts leafy, setaceous, greatly overtopping inflorescence.

simple or compound anthelae with numerous small pedunculate clusters of sessile spikelets;

scapes linear, distally terete, 1–2 mm thick;

involucral bracts short, usually shorter than inflorescence.

greenish, cylindric to lanceoloid-cylindric, 5–10 mm;

fertile scales narrowly ovate to lanceolate, 1–1.5 mm, acute, glabrous, midrib strong, excurrent as cusp.

greenish brown or yellow-brown, ovoid, 2–3 mm;

fertile scales broadly ovate, 1–1.5 mm, obtuse or apically notched, midrib not excurrent.

stamens 1;

styles 2-fid, slender, bulbous-based, smooth or papillate.

stamens usually 1;

styles 2-fid, slender, glabrous.

pale, tumidly obovoid, 0.5–0.7 mm, cancellate, pits horizontally rectangular in 5–7 vertical rows per side.

dark brown to nearly black, tumidly obovoid, rarely obscurely 3-ribbed, 1 mm, faintly striate to variously warty, faintly reticulate.

= 20.

= 56.