Herbs perennial. Stems 40-100 cm tall, robust, glabrous, grooved. Basal leaves: petiole to 30 cm; leaf blade broadly triangular-ovate, 8-25 × 5-20 cm, abaxially densely papillate along veins, adaxially glabrous, base deeply cordate, margin entire or slightly undulate, apex obtuse; cauline leaves shortly petiolate, oblong-ovate, small, base cordate, apex obtuse; ocrea fugacious, membranous. Inflorescence paniculate. Flowers bisexual. Pedicels slender, articulate at base. Outer tepals ca. 2 mm; inner tepals enlarged in fruit; valves elliptic, 5-6 mm, all with tubercles, net veined, base rounded, apex obtuse. Achenes dark brown, shiny, ovoid, trigonous, 2.5-3 mm. Fl. May-Jun, fr. Jun-Jul.
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A herb. It keeps growing from year to year. It is 40-100 cm tall.
Wet places in high mountains, N. Japan. Moist valleys, along streambanks; at elevations from 400-2,800 metres. River banks and sea coasts.
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It is a temperate plant. It grows between 400-2,800 m above sea level.
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