| Cassia chiapensis Standl., 1919 |
| Cassia cinerea Schltdl. & Cham., 1830 |
| Cassia cobanensis (Britton & Rose) Lundell, 1937 |
| Cassia coluteoides Collad., 1816 |
| Cassia confinis Greene, 1897 |
| Cassia corymbosa Ortega, 1800 |
| Cassia covesii A. Gray, 1868 |
| Cassia crotalarioides Kunth, 1822 |
| Cassia cubensis Schery, 1951 |
| Cassia deamii (Britton & Rose) Lundell, 1937 |
| Cassia demissa Rose, 1906 |
| Cassia demissa var. demissa Rose, 1906 |
| Cassia demissa var. radicans H.S. Irwin & Barneby, 1975 |
| Cassia densiflora M. Martens & Galeotti, 1843 |
| Cassia desvauxii Collad., 1816 |
| Cassia desvauxii var. mollissima Benth., 1870 |
| Cassia didymobotrya Fresen., 1839 |
| Cassia diphylla L., 1753 |
| Cassia disadena Steud., 1843 |
| Cassia doylei (Britton & Rose) Lundell, 1937 |