Flora of North America species comparison

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

erect to excurved, leafy, obscurely trigonous, slender.

overtopped by culm;

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

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

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

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 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.

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.

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.

bristles 6, some reaching to apex of fruit body.

perianth bristles mostly 6, rarely reaching fruit midbody, 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.

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.