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Annual herb, to 40 cm high, with ascending, glandular-pubescent, laxly foliated branches. Leaves sessile, narrowly obovate to oblanceolate, decreasing in size up stem and becoming ± linear-lanceolate, 1–6 (–7) cm long, 3–18 (–25) mm wide, basally cuneate, very shallowly and remotely sinuate-dentate to shallowly pinnatifid, rarely entire, ± obtuse-subacute, densely pubescent. Capitula 3.5–4.5 cm diam., solitary; peduncle robust, 5–12 cm long, striate, glandular; involucre campanulate; bracts lanceolate or linear-lanceolate, 6–10 (–12) mm long, 1.5–3 mm wide, marginally scarious, acuminate. Ray florets female, fertile; ligules 2–3 cm long, white above, violet-bluish or purple (rarely coppery) beneath. Disc florets bisexual, yellow; lobes acute, bluish to purplish. Ray achenes obpyramidal, 4–6 mm long, tuberculate; disc achenes ovate, 6–8 mm long, 5–6 mm wide, with 2 lateral wings, apically emarginate.
Erect to sprawling, glandular-hairy annual, up to 500 mm tall. Leaves oblong to oblanceolate, sinuate-dentate, lobed or toothed, upper leaves sublinear and subentire. Flowerheads radiate, solitary. Pedunculate; ray florets white above with a dark purple or violet zoned-base, often copper-tinted, less often brown or white below; disc florets white with yellow tips. Cypselas of ray florets obpyramidal triangular, transversely wrinkled or tuberculate with crenate or entire angles, occasionally smooth, of disc florets flat, winged, obovate or obcordate.
Erect to sprawling, glandular-hairy annual to 30 cm, branching from the base. Leaves oblanceolate, lobed to toothed. Flower heads radiate, solitary at branch tips, purple with white rays purple at base and darker on reverse. Ray achenes tubercled, disc achenes flattened.
