| Cassia apiculata M. Martens & Galeotti, 1843 |
| Cassia arborescens Mill., 1768 |
| Cassia argentea Kunth, 1824 |
| Cassia arida Rose, 1906 |
| Cassia armata S. Watson, 1879 |
| Cassia articulata Rose, 1909 |
| Cassia atomaria L., 1767 |
| Cassia atomaria var. glabrata Benth., 1871 |
| Cassia aurivilla Mart. ex Benth., 1870 |
| Cassia axillaris Sessé & Moc., 1893 |
| Cassia babylonica Schrank, 1805 |
| Cassia bacillaris L. f., 1782 |
| Cassia bauhinioides A. Gray, 1850 |
| Cassia bauhinioides var. arizonica B.L. Rob. ex J.F. Macbr., 1919 |
| Cassia bauhinioides var. pilosior B.L. Rob. ex J.F. Macbr., 1919 |
| Cassia berlandieri Benth., 1871 |
| Cassia bicapsularis L., 1753 |
| Cassia biflora L., 1753 |
| Cassia bimarginata Griseb., 1858 |
| Cassia bonplandiana DC., 1825 |