Herbs glabrous. Stems usually 30-65 cm long, rooted at nodes. Stipular sheath 1.5-2 cm, ca. 1/3 as long as petiole; petiole 1.5-7 cm; leaf blade reniform-cordate, (1.5-)3-6.5 × (3-)4-7.5 cm, base auriculate, apex broadly acute or rounded; sometimes outermost pair of veins slender or inconspicuous; reticulate veins ± conspicuous. Inflorescence 2-7.5 cm; peduncle ca. as long as or slightly shorter than inflorescence, 3-6 cm. Bract beneath each flower oblanceolate, ca. 3 mm, apex acute, sometimes basal bracts slightly larger and nearly ligulate. Filaments nearly as long as or slightly longer than anthers. Ovary long obovoid. Fl. Apr-Nov. 2n = 18*.
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