| Ruellia foetida Willd., 1809 |
| Ruellia foliosepala T.F. Daniel, 2008 |
| Ruellia fruticosa Sessé & Moc., 1889 |
| Ruellia galeottii Leonard, 1938 |
| Ruellia geminiflora Kunth, 1818 |
| Ruellia glabrata (Leonard) Tharp & F.A. Barkley, 1949 |
| Ruellia gooddingiana A. Nelson, 1931 |
| Ruellia guatemalensis Donn. Sm., 1909 |
| Ruellia guerrerensis T.F. Daniel, 1993 |
| Ruellia harveyana Stapf, 1913 |
| Ruellia hirsutoglandulosa (Oerst.) Hemsl., 1882 |
| Ruellia hookeriana (Nees) Hemsl., 1882 |
| Ruellia humifusa (Oerst.) Hemsl., 1882 |
| Ruellia intermedia Leonard, 1927 |
| Ruellia inundata Kunth, 1817 |
| Ruellia jaliscana Standl., 1926 |
| Ruellia jimulcensis Villarreal, 1998 |
| Ruellia jussieuoides Schltdl. & Cham., 1831 |
| Ruellia lactea Cav., 1795 |
| Ruellia lanatoglandulosa (Nees) Lindau, 1895 |