Herbs perennial. Rhizome black-brown, large, curved, 1.5-3 cm in diam. Stems 1-3 from rhizome, erect, 40-90 cm tall, simple, glabrous, striate. Basal leaves long petiolate; petiole 10-20 cm; leaf blade gray-green abaxially, green adaxially, narrowly ovate, 5-15 × 3-7 cm, abaxially sparsely small papillose, adaxially glabrous, base subcordate or rounded, decurrent along petiole, forming narrow wing, apex acute. Cauline leaves ovate or lanceolate-ovate, base cordate, clasping; upper leaves linear; ocrea: lower part green, upper part brown, tubular, membranous, dehiscent, not ciliate. Inflorescence terminal, spicate, dense, 3-5 cm, 1.2-1.5 cm in diam.; bracts broadly elliptic, 3-4 mm, apex caudate, each 1-3-flowered. Pedicels longer than bracts, slender. Perianth pinkish, 5-parted; tepals elliptic, ca. 2.5 mm. Stamens 8, exserted. Styles 3; stigmas capitate. Achenes exceeding persistent perianth, black-brown, shiny, ovoid, sharply trigonous, ca. 3 mm. Fl. Jul-Aug, fr. Aug-Sep.
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