Herbs, stout perennial. Stems 0.5-1.5 m. Leaves: 1-3 pairs near base; petiole 3-7 cm; blade broadly ovate to almost round, 5-15 × 4-19 cm, base cordate, rarely rounded, apex rounded or broadly obtuse, adaxial surface dull green to pale green, abaxial surface grayish green, often very pale, both surfaces glabrous or sparsely villous with fine hairs with pale brown or blackish pustulate bases. Flowers borne singly or in ill-defined clusters of 2-5 on branches of inflorescence; perianth 25-35 mm, tube greenish bronze, limbs white, pink, or rose-pink, abruptly flared from tube, glabrous or minutely pubescent externally at edge (pubescence most easily seen at tip of mature bud); stamens 3, exserted 25-40 mm. Fruits biturbinate, 4.2-8 × 2.6-4.6 mm, secreting mucilage when wetted; ribs 10, narrow, undulate; equatorial flange well developed, sinuate.
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