Flora of North America species comparison

erect to spreading-ascending, leafybased, trigonous or compressed, ribbed.

stiffly erect, leafy, triangular, multiribbed.

exceeded by scape;

blades narrowly linear to filiform, 0.2–2 mm wide, apex tapering, trigonous.

ascending, overtopped by inflorescence;

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

terminal, solitary, headlike, dense, white, leafyinvolucrate, hemispheric to globose, 0.5–1.5 cm wide;

involucral bracts (0–)1–4, ascending to recurved, green, (0.7–)2–5(–6) cm × 0.2–2 mm.

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

bracteal leaves mostly exceeding subtended compounds.

white, ovoid, 5–7 mm;

fertile scales several, boat-shaped, 2.5–3.5 mm, keel curved, not sharp.

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

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

perianth absent.

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

0.8–1 mm;

body yellow to near black, broadly pyriform-obovoid, tumidly lenticular, 0.5–0.8 × 0.5–0.8 mm, margin narrow, flowing into tubercle;

surfaces transversely sharply wavyrugose, ridges bordered by rows of fine, linear, vertical lattices;

tubercle depressedtriangular, lunate-based, shortbeaked 0.2(–0.3) mm, gray-crustaceous.

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.