Stem erect, 40-180 cm tall, white floccose-lanate or glabrous, 3-10 mm in diam. at base, with a circle of dense reddish brown lanate hairs. Basal leaves petiolate; petiole 5-30 cm, without wings, floccose-lanate or glabrous, base narrowly sheathed; leaf blade sagittate, ovate-sagittate, or oblong-sagittate, 6-14(-35) × 4-11 cm, glabrous, pinnately veined, margin minutely denticulate, apex obtuse or acute; sinus broad, basal lobes coarsely dentate. Middle stem leaves similar but smaller, shortly petiolate, without wings, white lanate in axils. Distal stem leaves sessile, ovate-lanceolate to narrowly lanceolate, apex acuminate. Compound corymbs spreading; branches to 10 cm; leaflike and supplementary bracts narrowly lanceolate to subulate, 1-3 mm; peduncles 2-7 mm, glabrous. Capitula numerous. Involucre narrowly cylindric, 6-9 × (2.5-)4 mm, outside glabrous; phyllaries 5-7, in 2 rows, oblong or ovate-oblong, apex obtuse; inner phyllaries white membranous at margin. Ray florets 3 or 4, yellow; lamina oblong, 6-10 × 2-4 mm, apex rounded, minutely denticulate; tube 3-4 mm. Tubular florets 8-13, 6-10 mm, extending from involucre; tube 2-3 mm. Achenes yellowish, oblong, 4-5 mm. Pappus white, as long as tubular corolla. Fl. and fr. Jun-Aug.
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