Herbs perennial, 40--100 cm tall, glabrous or sparsely villous. Stems stout, longitudinally striate. Leaves 3-verticillate, sessile, oblong or elliptic, 6--8 × 1.5--4 cm, base cuneate or amplexicaul, apex obtuse. Cyme terminal; bracts 3-verticillate, leaflike, elliptic-lanceolate. Flowers large; pedicel 1--4 cm. Sepals glossy, oblong-lanceolate, 0.9--1.1 cm × 4--5 mm, margin membranous, apex acute. Petals white, obcordate, 2-lobed for ca. 1/3 their length. Stamens 10, equaling sepals. Styles 5. Capsule not seen.
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