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DescriptionHerbs 1-1.5 m tall. Rhizome brown, to 35 × 2-3 cm, with adventitious roots at nodes. Stem simple, proximally sparsely rigidly glandular hairy. Basal leaf 1; petiole 30-60 cm, spinose glandular hairy; leaf blade 1.8-6(-10) cm in diam., lobes broadly ovate, both surfaces rigidly hairy or rigidly glandular hairy, margin incised-dentate and irregularly serrate, apex acute or shortly acuminate. Cauline leaves smaller than basal one, 3-5-palmatilobed, base cuneate or truncate. Panicle 15-20 cm, many flowered. Sepals ovate, ca. 2 × 1.7-1.8 mm, leathery, abaxially sparsely subsessile glandular hairy, adaxially and marginally glabrous, veins 5, apically confluent, apex obtuse or retuse. Petals white or lilac, obovate-oblong. Filaments 2.4-2.5 mm. Capsule 6.5-7 mm. Seeds ca. 2.2 mm. Fl. Aug-Sep. 2n = 34, 36.