Flora of North America species comparison

erect, leafy, nearly terete or angled, manyribbed.

erect, slender, leafy-based, trigonous, several-ribbed.

spreading to erect, overtopped by culm;

blades narrowly linear, proximally flattened, 0.5–3 mm wide, apex tapering, trigonous.

terminal and axillary, clusters of corymbs 1–5, usually diffuse; leafy bracts exceeding proximal corymbs.

terminal, solitary, headlike, dense, white, leafy-involucrate;

involucral bracts several, flaring to recurved, white from broadened base nearly to median, then green to tapered tip, longer bracts 13 cm × 2–7 mm.

dark brown, lanceoloid to ovoid, mostly 4–6(–8) mm, apex acute;

fertile scales many, ovate, rounded-convex, 2–3.5 mm, apex acute, midrib mostly included, rarely forming apiculus.

white, ovoid, 5–7 mm, apex acute;

fertile scales many, boatshaped, sharply curvedkeeled, 3–4(–5) mm, apex acute or blunt.

perianth absent.

perianth absent.

1–1.3(–1.5) mm, body dark brown, tumidly lenticular, nearly orbicular, 0.7–1 × 0.7–1 mm, margins strong, interrupted at tubercle base;

surfaces irregularly transversely rugulose with wavy rows of vertical, linear, raised cells;

tubercle depressed-triangular, 0.1–0.3 mm, capping fruit summit, base broadly 2lobed.

several per spikelet, 1.5–1.7(–2) mm;

body yellow to mahogany, broadly pyriformobovoid, tumidly lenticular, 1 × 0.5–0.7 mm, widest at apex, margins thickened, interrupted at base of tubercle;

surfaces transversely undulaterugose, ridges contiguous, of shortlinear papillae;

tubercle broadly triangular, 0.5–0.6 mm, graycrustaceous, apex short acuminate.

midculm leaves often exceeding inflorescences;

blades linear, proximally flattened, 1–5 mm wide, apex trigonous, tapering.

= 12.