Herbs 20-50 cm tall, annual. Stem erect, subdivaricately branched from near base, with multicellular hairs below but glabrescent or glabrous above. Basal leaves oblanceolate, 5-10 × 1.5-3.5 cm, lyrately pinnatipartite to pinnatisect, both faces glabrous or ± pubescent with multicellular hairs, base attenuate into a petiole-like portion, margin sinuate-dentate; lateral lobes 2 or 3 pairs, elliptic to narrowly elliptic; terminal lobe triangular, apex acuminate. Lower and middle stem leaves similar to basal leaves; upper stem leaves ± linear, reduced in size, undivided or acutely 2-lobed near base. Synflorescence paniculiform-corymbiform, with several to many capitula. Capitula with 13-15 florets; peduncle capillaceous. Involucre cylindric, 6-7 mm. Phyllaries abaxially glabrous; outer phyllaries ovate, less than 1 mm, apex acute; inner phyllaries ca. 8, adaxially appressed pubescent, midvein subapically plane, margin narrowly white scarious, apex ± acute. Anther tube green. Style branches yellow upon drying. Achene red, broadly fusiform, ca. 2 mm, subcompressed, ribs obscurely spiculate, apex attenuate into a stout 0.2-0.4 mm beak. Pappus white, 3-4 mm, ± caducous. Fl. and fr. Jun-Nov.
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