| Orthosia kunthii Decne., 1844 |
| Orthosia misera (L.O. Williams) W.D. Stevens, 2005 |
| Orthosia pubescens (Greenm.) Liede & Meve, 2008 |
| Orthosia stipitata W.D. Stevens, 2005 |
| Orthosiinae Liede & Rapini, 2005 |
| Otaria Kunth, 1819 |
| Otaria auriculata (Kunth) G. Don, 1837 |
| Otaria fragrans Benth., 1842 |
| Oxypetalinae E. Fourn., 1878 |
| Oxypetalum R. Br., 1810 |
| Oxypetalum cordifolium (Vent.) Schltr., 1899 |
| Oxypetalum huilense Pittier, 1910 |
| Oxypetalum riparium Kunth, 1819 |
| Pachypodium Lindl., 1830 |
| Pachypodium lamerei Drake, 1899 |
| Pachystelma Brandegee, 1920 |
| Pachystelma cordatum Brandegee, 1920 |
| Parsonsiinae Benth. & Hook. f., 1876 |
| Pattalias S. Watson, 1889 |
| Pattalias angustifolius (Torr.) S. Watson, 1889 |