| Quararibea guatemalteca (Donn. Sm.) Standl. & Steyerm., 1944 |
| Quararibea lopezperaltae Gallardo-Hern. & Lorea-Hern., 2010 |
| Quararibea mayanum Lorea-Hern. & Gallardo-Hern., 2010 |
| Quararibea verticillaris (Moc. & Sessé ex DC.) Vischer |
| Quararibea yunckeri Standl., 1940 |
| Quararibea yunckeri subsp. sessiliflora Miranda ex W.S. Alverson, 1998 |
| Quararibea yunckeri subsp. veracruzana W.S. Alverson, 1998 |
| Rebsamenia Conz., 1903 |
| Rebsamenia arborea Conz., 1903 |
| Reevesia Lindl., 1827 |
| Reevesia clarkii (Monach. & Moldenke) S.L. Solheim ex Machuca-Macucha, 2017 |
| Rhynchosida Fryxell, 1978 |
| Rhynchosida physocalyx (A. Gray) Fryxell, 1978 |
| Riedlea Vent., 1807 |
| Riedlea depressa (L.) DC., 1824 |
| Robinsonella Rose & Baker f., 1897 |
| Robinsonella brevituba Fryxell, 1973 |
| Robinsonella chiangii Fryxell, 1984 |
| Robinsonella cordata Rose & Baker f., 1897 |
| Robinsonella densiflora Fryxell, 1973 |