Flora of North America species comparison

erect to excurved, leafy, obscurely trigonous, slender.

erect or ascending, leafy, trigonous.

spreading to ascending, shorter than culm, crowded toward culm base;

blades linear, proximally flat, 1–3 mm wide, gradually involute, apically trigonous, subulate.

exceeded by culm;

blades linear, proximally 4–7 mm wide, apex trigonous, tapering.

spikelet clusters 1–4, dense to open, mostly irregularly turbinate;

peduncles ascending, branches spreading to erect, ultimate branches with many spikelets; leafy bracts setaceoustipped, usually exceeding all clusters, or at least all but the distal.

terminal and axillary;

clusters 3–6, mostly dense, narrowly to broadly turbinate, branches ascending; leafy bracts exceeeding proximalmost inflorescences.

light redbrown or brown, broadly ellipsoid to lanceoloid, 3–4 mm, apex acute to acuminate;

fertile scales ovate to obovate or suborbiculate, 2–3.5 mm apex acute to rounded or emarginate, midrib included or exserted as mucro.

rich brown, ovoid, (3–)4–5 mm, apex acuminate;

fertile scales ovate, 2.5–3.5 mm, apex acuminate, midrib included or shortexcurrent.

perianth bristles mostly 6, rarely reaching fruit midbody, antrorsely barbellate.

perianth bristles mostly 6, exceeding tubercle tip.

mostly 1 per spikelet, 2–2.5 mm, body dark brown, obovoid to subglobose, tumid or lenticular, 1.5–1.7 mm, transversely finely rugose to nearly level, intervals with very small, pitlike alveoli.

mostly 3–4 per spikelet, 2–2.2 mm;

body brown on short pedicellar (to 0.3 mm) stalk, broadly obovoid, lenticular, 1.3–1.5 × 1–1.5 mm, surfaces transversely rugulose, vertically finely striate and rectangularalveolate;

tubercle compressed, triangular acuminate, 0.5–0.8 mm, edges setulose.