Herbs, annual, 30-100 cm tall. Stems erect, solitary, rigid, usually divaricately branched in upper part, white puberulent, glabrous in lower part. Leaves remote; basal leaves persistent or withered at anthesis; median leaves large; petiole narrowly winged, 0.5-4 cm; blade elliptic-lanceolate to elliptic or rhombic-elliptic, or broadly ovate to cordate, 4-12 × 2-5 cm, both surfaces sparsely puberulent or glabrescent, usually rather densely hairy on veins, base broadly or narrowly cuneate, margin crenate or incised, serrate, or doubly serrate, apex acute or obtuse; upper and lower leaves smaller, shortly petiolate. Capitula few, rarely many, small, in a lax or dense corymb or panicle; peduncle 0.8-3 cm, gray-white or ferruginous puberulent; involucre hemispheric, 4-5 × 6-8 mm, to 10 mm in diam. at fruiting; phyllaries 2-seriate, green, subequal, narrowly elliptic, thin, submembranous, outer phyllaries mostly connate, sparsely white villous, apex obtuse; corollas ca. 2.5 cm, viscid-glandular, pubescent. Achenes blackish brown when mature, oblanceolate, ca. 4 × 1 mm, glandular, sometimes densely tuberculate, contracted at base, apex obtuse; pappus elements clavate, ca. 4.1 mm, basally connate into a ring, fulvous viscid-glandular. Fl. and fr. Aug-Oct. 2n = 20.
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Annual or short-lived perennial, semi-prostrate or erect, fleshy herb 0.3–1 m tall; stems sparsely hairy at apex. Leaves with petiole 10–70 mm long; lamina lanceolate to narrowly or broadly ovate, 50–160 (–200) mm long, (15–) 30–60 mm wide, acute at base, serrate to crenate, acute, ±glabrous or sparsely hairy along veins on both surfaces; upper surface dull or slightly shiny when dried, with scattered white cyst-like hair bases. Panicles on slender peduncles. Capitula ±globose, 8–10 mm diam.; involucral bracts in 2 series, narrowly oblong to spathulate, 3–4 mm long, rounded, reflexed, pilose becoming ±glabrous with age, with hairs more frequent towards base. Florets white. Achenes plano-convex to 3-angled, ±flattened radially, 2.7–3.5 mm long, muricate, sometimes with sparse glandular hairs, yellow to brownish at maturity.
A herb. It grows 1 m high. The leaves are simple and 2-20 cm long by 1-13 cm wide. The leaves get smaller from the base upwards. The leaf stalks are 1-6 cm long. The flowering stalk has a panicle of heads. The flower heads are 3-7 mm across. They are white. The fruit is a nut. It is black and 2-4 mm long and 1 mm wide.
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