Flora of North America species comparison

erect or ascending, terete to obscurely trigonous, multiribbed, densely leafybased, slender, stiff, papillose to scabridpuberulent.

ascending-excurved, leafy, ± terete, slender.

forming strong rosette, distal widely spaced, much exceeded by scape;

basal leaf blades shortlinear, flat, 4–6 mm wide, culm leaf blades narrower, longer, all ciliate, apex bluntly acute.

ascending, overtopped by culm;

blades narrowly linear, proximally flat, 2–3 mm wide, apex trigonous, tapering.

terminal;

spikelet cluster 1, crowded, hemispheric, often lobed, to 2 cm wide;

bracts strongly ciliate distally;

longer leafy bracts exceeding cluster.

spikelet clusters (1–)2–3, widely spaced, open to dense, broadly to narrowly turbinate, branches ascending to slightly spreading, capillary; leafy bracts setaceous-tipped, overtopping all but distal clusters.

dark redbrown, ovoid, 4–5(–6) mm, apex acute;

fertile scales broadly ovate, 4–4.5 mm, apex blunt, sometimes apiculate or with mucro to 1 mm, midrib scabrid.

light red-brown, ovoid, 3.5–5 mm, apex acuminate;

fertile scales ovate, 2.5–3.5 mm, apex acute, midrib excurrent as cusp or mucro.

bristles 6, some vestigial, none reaching past fruit midbody, antrorsely barbellate.

perianth bristles 6, reaching at most 2/3 length of fruit body, antrorsely barbellate.

1–2 per spikelet, (1.9–)2–2.5 mm;

body dark brown with paler center, lenticular, broadly ellipsoid to orbicular, 1.6–2 × 1.5–1.6 mm, margins flowing to tubercle;

tubercle lowtriangular, 0.5 mm, often apiculate.

1–4(–5) per spikelet, 2 mm;

body brown, strongly compressed, obovoid-ellipsoid, 1.4–1.6 × 1–1.2 mm, margins flowing to tubercle;

surfaces finely transversely rugose, intervals with narrow vertical alveolae;

tubercle flat, low-triangular, 0.2–0.3(–0.5) mm.