Herbs 10-25[-50] cm tall, annual, glabrous. Stem solitary, erect, branched from base. Basal leaves withered at anthesis. Lower and middle stem leaves with a slender petiole often basally with well-developed dentate or dissected auricles; leaf blade ± elliptic, 2-6[-12] × 0.5-3[-6] cm, irregularly and interruptedly pinnatisect, rachis wingless; lateral lobes 1-4 pairs, opposite to alternate, ovate, elliptic, falcate, rhombic, or oblanceolate, margin sparsely dentate to incised; terminal lobe similar to lateral ones. Upper stem leaves similar to lower and middle stem leaves. Synflorescence of main stem and branches corymbiform or paniculiform, with few to many capitula. Capitula with ca. 5(or 6) florets. Involucre narrowly cylindric, 5-7 mm. Outer phyllaries few, ovate, longest 0.6-1 mm, apex obtuse to acute; inner phyllaries 5, apex acute to obtuse. Anther tube and style greenish to blackish upon drying. Achene brownish, fusiform, 2.5-3.5 mm, with 10-15 apically long papillose ribs, apex attenuate or with a beak to 0.7 mm. Pappus white, 3.5-4.5 mm. Fl. and fr. Sep-Oct. 2n = 10.
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