| Dialypetalantheae Reveal, 2012 |
| Didymaea Hook. f., 1873 |
| Didymaea alsinoides (Cham. & Schltdl.) Standl., 1938 |
| Didymaea alsinoides var. mollis Standl., 1938 |
| Didymaea crassifolia Borhidi, 2003 |
| Didymaea floribunda Rzed., 1983 |
| Didymaea hispidula L.O. Williams, 1975 |
| Didymaea ixtepejiensis Borhidi & E. Martínez, 2012 |
| Didymaea linearis Standl., 1929 |
| 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 |