mucronate

Fruit oblong, with very slender ribs, no oil-tubes, depressed stylopodium, and seed-face somewhat concave.—Smooth annual, with ovate perfoliate entire leaves, no involucre, involucels of 5 very conspicuous ovate mucronate bractlets, and yellow flowers.

Leaves linear to oblong-lanceolate; heads many, crowded; scales close, obtuse or the uppermost mucronate; achene smooth.—Low grounds, Ohio and Ky. to Dak., and southward.

Usually tall; leaves lanceolate or lance-oblong; cyme loose; scales close, obtuse or mucronate; achenes hispidulous on the ribs.—Low grounds, W. Penn. to Ill., and southward.—Heads variable, 2–4´´ high and the scales in few or many ranks; the var. grandiflòra, Nutt., with large heads, the involucre of 35–40 scales in many ranks.

Anthers oblong-linear or arrow-shaped, mucronate, inserted in the throat.

Sparsely hairy or nearly smooth; leaves varying from oblong with a somewhat heart-shaped base to linear, mucronate or emarginate; peduncles 1–7-flowered; bracts shorter than the pedicels; sepals pointed, glabrous or nearly so; corolla white; filaments hairy; styles united at base.