Herbs perennial. Roots black-brown, large, to 2.5 cm in diam. Stems erect, 30-60 cm, grooved, branched. Basal leaves: petiole 3-4 cm; leaf blade oblong, 5-20 × 3-8 cm, both surfaces glabrous, midvein prominent abaxially, base rounded or subcordate, margin slightly undulate, apex obtuse or acute; cauline leaves shortly petiolate, small; ocrea fugacious, membranous. Inflorescence paniculate, large, lax. Flowers bisexual. Pedicel articulate below middle. Outer tepals elliptic; inner tepals enlarged in fruit; valves triangular-cordate, 5-6 mm, all valves with tubercles, conspicuously net veined, base subcordate, margin denticulate, apex acute; denticles 1-1.5 mm; tubercles oblong, ca. 2 mm. Achenes brown, shiny, ellipsoid, sharply trigonous, 2.5-3 mm, base narrow, apex acute. Fl. Apr-May, fr. May-Jun.
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