| Didymaea mexicana Hook. f., 1873 |
| Didymaea microflosculosa L.O. Williams, 1975 |
| Didymaea microphylla L.O. Williams, 1975 |
| Didymaea naniflora Borhidi & E. Martínez, 2012 |
| Diodella Small, 1913 |
| Diodella apiculata (Willd.) Delprete, 2004 |
| Diodella crassifolia (Benth.) Borhidi, 2006 |
| Diodella sarmentosa (Sw.) Bacigalupo & Cabral ex Borhidi, 2006 |
| Diodella serrulata (P. Beauv.) Borhidi, 2006 |
| Diodella teres (Walter) Small, 1913 |
| Diodia L., 1753 |
| Diodia apiculata (Willd. ex Roem. & Schult.) K. Schum., 1889 |
| Diodia aspera Brandegee, 1914 |
| Diodia brasiliensis Spreng., 1824 |
| Diodia brasiliensis var. angulata (Benth.) Standl., 1935 |
| Diodia crassifolia Benth., 1845 |
| Diodia maritima Thonn., 1827 |
| Diodia ocymifolia (Willd. ex Roem. & Schult.) Bremek., 1934 |
| Diodia polymorpha Cham. & Schltdl., 1828 |
| Diodia polymorpha var. angulata (Benth.) K. Schum., 1888 |