Annual, herbs, 12–50 cm tall. Stem erect, branched, pubescent, more dense near the inflorescence. Leaves glandular, irregularly bipinnatisect, sessile, segments ovate–obovate, acute–acuminate, 2.5–7 cm long, 1.5–3 cm wide, purplish at midrib and margins, dentate. Capitula many, disciform, in terminal corymbs, ± spherical, 4–5 mm in diameter. Involucre hemispherical, phyllaries 1–3–seriate, subequal, membranous, 2–3 mm long, 0.5–1 mm wide, elliptic–lanceolate, acute, sparsely glandular hairy. Ray florets female, purple, filiform, ligule narrowly funnelform, 2–lobed. Disc florets few, tubular, purple, functionally male wilth rudimentary carpels. Cypselas oblong to fusiform, 0.5–1 mm long. Pappus absent.