| Cascabela pinifolia (Standl. & Steyerm.) L.O. Alvarado & Ochot.-Booth, 2007 |
| Cascabela thevetia (L.) Lippold, 1980 |
| Cascabela thevetioides (Kunth) Lippold, 1980 |
| Catharanthinae Pichon ex Boiteau, 1981 |
| Catharanthus G. Don, 1837 |
| Catharanthus roseus (L.) G. Don, 1837 |
| Cerbera L., 1753 |
| Cerbera ahouai L., 1753 |
| Cerbera cuneifolia Kunth, 1819 |
| Cerbera nitida Kunth, 1819 |
| Cerbera ovata Cav., 1796 |
| Cerbera peruviana Pers., 1805 |
| Cerbera thevetia L., 1753 |
| Cerbera thevetioides Kunth, 1819 |
| Ceropegieae Decne. ex Orb., 1843 |
| Chthamalia Decne., 1844 |
| Chthamalia decumbens (W.D. Stevens) L.O. Alvarado & E.B. Cortez, 2021 |
| Chthamalia nummularia Decne., 1844 |
| Chthamalia ojadapantha (L.O. Alvarado, S. Islas & M.G. Chávez) S. Islas & M.G. Chávez, 2021 |
| Chthamalia parviflora (Torr.) L.O. Alvarado & E.B. Cortez, 2021 |