Plants 60–200 cm. Stems usually greenish purple, sometimes evenly purplish, solid, usually glandular-pubescent throughout, sometimes densely puberulent and sparingly glandular. Leaves mostly in 3s–4s; petioles (0.7–)1.3–2.8(–3.6) mm, glabrate to densely ciliate; blades pinnately veined, lance-ovate or ovate to deltate-ovate, mostly 7–30 × 2.5–18 cm, relatively firm, bases abruptly or gradually tapered, margins sharply serrate, abaxial faces ± glandular-pubescent and sparsely hirsute (at least midribs and main veins), adaxial faces scabrous-hirsute, glabrescent. Heads in loose, convex, compound corymbiform arrays. Involucres often purplish, 6.5–9 × 3.5–5 mm. Phyllaries mostly glabrous, outer sometimes hairy on midveins. Florets (5–)6–9(–10); corollas usually pale pinkish or purplish, 4.5–7 mm. Cypselae 3–4.5 mm. 2n = 20.
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