Herbs glabrous. Stems usually 30-70 cm long. Stipular sheath 1.5-2 cm, 1/4-1/3 as long as petiole; petiole 1.5-8.5 cm; leaf blade cordate or reniform-cordate, 4-18 × 6-10 cm, base deeply auriculate, apex broadly acute; reticulate veins conspicuous. Inflorescence ca. 5 cm, usually leaf-opposed at middle of stems; peduncles 4-7 cm, slightly longer than or nearly as long as inflorescences; involucral bracts 3 or 4, white, leafy, very large, 1.2-1.8 × 0.8-1.2 cm, obovate-oblong. Bract beneath each flower obovate-oblong or oblanceolate, ca. 3 mm, apex acute. Filaments slightly longer than anthers. Ovary obconical. Fl. Feb-Jun. 2n = 18*.
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