Flora of North America species comparison

erect to excurved, leafybased, filiform.

stiffly erect, leafy, triangular, multiribbed.

shorter than culm;

blades ascending to excurved, filiform, proximally to 1 mm wide, margins involute, apex trigonous, subulate, tapering.

ascending, overtopped by inflorescence;

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

spikelet clusters 1–3, laterals 0–2, turbinate, rarely hemispheric; leafy bracts setaceous, overtopping inflorescence.

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

bracteal leaves mostly exceeding subtended compounds.

redbrown, narrowly lanceoloid, 5–7 mm, apex acute;

fertile scales lanceolate, 3.5–5 mm, apex acute, mucronate.

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.

2(–5) per spikelet, (1.7–)2–2.2 mm;

body on short, setulose receptacular stipe, brown with pale center, obovoidlenticular, 0.8–1.1 mm, surfaces very finely longitudinally lined, sometimes faintly reticulatecancellate;

tubercle triangular subulate, 0.7–0.9 mm, base lunate, edges 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.