Herbs perennial. Roots robust. Stems erect, 100-150 cm tall, branched, striate, glabrous. Petiole 3-4 mm; leaf blade greenish abaxially, green adaxially, ovate or ovate-lanceolate, 5-10 × 2-4 cm, abaxially pubescent, adaxially nearly glabrous, base broadly cuneate, margin bristly ciliate, apex acuminate or acute; ocrea caducous, brown, tubular, 1.5-2.5 cm, membranous, sparsely long villous. Inflorescence terminal, paniculate; branches spreading, rachis and branches glabrous; bracts lanceolate, each 1-or 2-flowered. Pedicel 3-4 mm, not articulate, dilated above. Perianth white, 5-parted; tepals obovate, 3-3.5 mm. Stamens 8, included. Styles 3; stigmas capitate. Achenes equaling persistent perianth, shiny, broadly ovoid, trigonous, 3-4 mm, smooth. Fl. Jun-Jul, fr. Aug-Sep.
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