Cotylonia C. Norman.

Herbs annual or biennial, glabrous. Rootstock short and thick, roots fibrous, fasciculate. Stem erect, smooth, unbranched, leafless. Leaves long-petiolate; petiole expanded at base into short sheath; blade orbicular or reniform. Inflorescence terminal; umbels simple; bracts 2, foliaceous. Calyx teeth minute or obsolete. Petals ovate, flat, apex obtuse. Stylopodium conic; styles very short. Fruit rectangular-cubic, flattened dorsally; dorsal rib filiform, prominent, intermediate ribs obscure, lateral ribs winged; vittae obscure. Seed face plane. Carpophore shortly bifid at the apex, persistent.

One species.

(Authors: She Menglan (佘孟兰 Sheh Meng-lan); Mark F. Watson)