| Poinsettia strigosa (Hook. & Arn.) Arthur, 1912 |
| Polyboea Klotzsch, 1850 |
| Polyboea crassifolia (Benth.) Klotzsch, 1851 |
| Polyboea laurifolia Klotzsch, 1851 |
| Pseudoglochidion Gamble, 1925 |
| Psilostachys Turcz., 1843 |
| Pycnosandra Blume, 1856 |
| Redia Casar., 1843 |
| Ricinella Müll. Arg., 1865 |
| Ricinella barbinervis (Schltdl. & Cham.) Müll. Arg., 1865 |
| Ricinella myricifolia (Scheele) Müll. Arg., 1865 |
| Ricinella oaxacana Müll. Arg., 1865 |
| Ricininae Griseb., 1859 |
| Ricinocarpos Desf., 1817 |
| Ricinocarpos adenostachyus (Müll. Arg.) Kuntze, 1891 |
| Ricinocarpos alopecuroidea (Jacq.) Kuntze, 1891 |
| Ricinocarpos anemioides (Kunth) Kuntze, 1891 |
| Ricinocarpos aristatus (Kunth) Kuntze, 1891 |
| Ricinocarpos arvensis (Poepp. & Endl.) Kuntze, 1891 |
| Ricinocarpos botterianus (Müll. Arg.) Kuntze, 1891 |