| Ruellia angustifolia Sw., 1788 |
| Ruellia blechum L., 1759 |
| Ruellia bourgaei Hemsl., 1879 |
| Ruellia breedlovei T.F. Daniel, 1990 |
| Ruellia brittoniana Leonard, 1941 |
| Ruellia californica (Rose) I.M. Johnst., 1924 |
| Ruellia californica subsp. peninsularis (Rose) T.F. Daniel, 1997 |
| Ruellia cedilloi Ramamoorthy, 1992 |
| Ruellia ciliatiflora Hook., 1840 |
| Ruellia coerulea Morong, 1893 |
| Ruellia comonduensis T.F. Daniel, 1999 |
| Ruellia conzattii Standl., 1924 |
| Ruellia corzoi Tharp & F.A. Barkley, 1949 |
| Ruellia cupheoides Fernald, 1901 |
| Ruellia davisiorum Tharp & F.A. Barkley, 1949 |
| Ruellia discolor Nees, 1847 |
| Ruellia donnell-smithii Leonard, 1941 |
| Ruellia dulcis Cav., 1801 |
| Ruellia erythropus (Nees) Lindau, 1895 |
| Ruellia eumorphantha Lindau, 1898 |