Corn marigold

Chrysanthemum segetum Linnaeus, Sp. Pl. 2: 889. 1753; Xantophtalmum segetum (Linnaeus) Schultz-Bipontinus

Leaf blades oblong to obovate or spatulate, 25–65+ × 8–25+ mm, coarsely 1-pinnate or not lobed, ultimate margins dentate or entire. Ray corollas golden yellow, laminae oblong-ovate, 8–20 mm. Ray cypselae weakly triquetrous, 2.5–3 mm, obscurely, if at all, winged, lateral faces 2-ribbed, abaxial faces 3-ribbed; disc cypselae ± compressed-columnar, 2–3 mm, 10-ribbed, not winged. 2n = 18.

Flowering Apr–Aug(–Oct). Disturbed sites; 0–100 m; introduced; Ala., Alaska, Calif., Conn., La., Maine, Mass., N.Y., N.C., Ohio, Oreg., Pa., S.C.; Eurasia; n Africa.