Herbs large, ca. 1 m tall. Rhizomes and roots dark brown, stout. Stem erect, hollow, glabrous. Petiole of basal leaf subterete, shorter than or ca. as long as blade, muricate beneath; leaf blade ovate-cordate, rarely ovate, large, 20-30 cm in diam., sometimes slightly longer than wide, abaxially pubescent, adaxially glabrous, basal veins 5-7, base cordate, margin entire, apex obtuse. Stem leaves shorter petiolate, small; ocrea short, glabrous or slightly muricate. Panicle large, densely branched. Pedicel slender, jointed below middle. Flowers fascicled. Tepals yellow, elliptic, subequal, ca. 2 mm. Fruit broadly ellipsoid to oblong-ellipsoid, ca. 1.2 × 1.1 cm, both ends cordate; wings narrower than seeds, ca. 3 mm wide, with longitudinal veins at middle. Seeds dark brown, ovoid to broadly ovoid. Fl. Jun-Jul, fr. Aug. 2n = 22, 44.
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A large herb. It grows 1 m tall. The rhizomes and roots are dark brown and stout. The stems are erect and hollow.
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