Flora of North America species comparison

erect or ascending, slender, leafy proximal to middle, somewhat stiff.

erect to ascending, leafiest at base, triangular, slender, somewhat stiff.

overtopped by culm;

blades ascending, ± filiform, proximally flat or slightly concave, to 1 mm wide, apex narrowing, trigonous, abruptly blunt.

exceeded by culm;

basal blades crowded, spreadingexcurved, distal ascending, linear, proximally flat, 3–5 mm wide, apex trigonous, shortsubulate.

spikelet clusters 1–2, if 2 then close together, dense, broadly turbinate to hemispheric or even globose;

primary leafy bract setaceous, exceeding clusters.

spikelet clusters 3–5, compact, the proximalmost widely spaced, turbinate or lobed to hemispheric; leafy bracts setaceous, mostly overtopping clusters.

redbrown, ovoid, 2–2.5(–4) mm, apex acute;

fertile scales broadly ovate, 1.5–1.9(–2) mm, apex acute to acuminate, midrib excurrent as awn to 0.5 mm.

redbrown, broadly ovoid, 3–3.5(–4) mm, apex acuminate;

fertile scales broadly ovate to ± orbiculate, 2–2.5(–3) mm, apex rounded to notched, midrib included or shortexcurrent.

bristles 6, some reaching to apex of fruit body.

perianth bristles 6, reaching from fruit midbody to tubercle, antrorsely barbellate.

2–3 per spikelet, 1–1.2(–1.4) mm;

body dull dark brown with paler brown center, lenticular, broadly obovoid to broadly ellipsoid, 1 × 0.8 mm, margins narrow, flowing to tubercle;

tubercle nearly equilaterally triangular, 0.2–0.3 mm.

1–2 per spikelet, (2–)2.5–2.8(–3) mm;

body brownish, broadly obovoid to nearly orbicular, 1.5–2 × 1.5–2 mm;

surfaces strongly transversely wavyrugose, intervals rows of vertical, rectangular alveolae;

tubercle conic-subulate, basal rim flaring above short neck on achene.