Didymodoxa E.Mey. ex Wedd.

Annual herbs, monoecious or (by abortion) dioecious. Leaves alternate, petiolate, serrate, crenate or entire; cystoliths punctiform; stipules free, lateral. Inflorescences usually bisexual, axillary, sessile, bracted, bracts free, not prominent, usually shorter than the flowers. Flowers: ♂ with a boat-shaped, sometimes almost bract-like perianth with erect tip and slightly fused cylindrical base, with 1 stamen, without rudimentary ovary; ♀ without perianth, ovary erect, with a subcapitate or shortly linear style. Achene slightly winged along one side, other side rounded, frequently 2 ovaries or achenes join along the rounded side to form a double fruit, which is much larger than two single fruits, both seeds developing in this case. Fig. 17/A–G.