Flora of North America species comparison

erect, leafybased, wandlike, nearly terete, multiribbed.

stiffly erect, leafy, triangular, multiribbed.

ascending or erect, longest nearly equaling culm;

principal blades linear, involutecylindric, to 3 mm wide, apex tapering, subulate.

ascending, overtopped by inflorescence;

blades flat proximally, 3–10(–15) mm wide, apex attenuate, trigonous.

terminal, heads 1–4, dense, macelike, 1–1.5 mm thick;

involucral bracts leafy, proximalmost overtopping inflorescence.

terminal and axillary, narrow, clusters of corymbs, clusters dense, mostly broadly turbinate, 13–15 mm;

bracteal leaves mostly exceeding subtended compounds.

greenish, lanceovoid, 5–6 mm, apex acuminate;

fertile scales boat-shaped, 5 mm, apex acute to shortacuminate, midrib slightly excurrent or not.

brown, lanceoloid, 13–15 mm, apex acuminate;

fertile scales lanceolate, 10–13 mm, apex acuminate, midrib shortexcurrent.

perianth bristles 6, exceeding fruit body, antrorsely barbellate.

longer perianth bristles usually fully 2 times length of fruit body, antrorsely barbellate.

1 per spikelet, 6–8(–8.7) mm;

body pale greenbrown, laterally compressed, obcordiform, 2.5–3(–4) mm, margins thick, rounded, not crimped, apex barely exserted, setulose, surfaces nearly plane, minutely cancellate (latticed);

tubercle (style base) linear, angled, 4–6 mm, much narrower than fruit summit, setulose.

1–2 per spikelet, 20–25 mm;

body pyriformobovoid, compressed, 5–6 × 2.6–3.6 mm;

tubercle attenuate, 2-grooved, (15–)18–20(–21) mm.

= 18.