| Ruellia laslobasensis E.A. Tripp, 2010 |
| Ruellia latibracteata D.N. Gibson, 1972 |
| Ruellia leucantha Brandegee, 1901 |
| Ruellia leucantha subsp. postinsularis (Gentry) T.F. Daniel, 1996 |
| Ruellia longepetiolata (Oerst.) Hemsl., 1882 |
| Ruellia longipila Standl., 1930 |
| Ruellia longissima D.N. Gibson, 1972 |
| Ruellia longissima var. glabra D.N. Gibson, 1972 |
| Ruellia longituba D.N. Gibson, 1972 |
| Ruellia macrocarpus Sessé & Moc., 1894 |
| Ruellia macrophylla Vahl, 1791 |
| Ruellia macrosiphon (Nees) Donn. Sm., 1889 |
| Ruellia malacosperma Greenm., 1899 |
| Ruellia matagalpae Lindau, 1895 |
| Ruellia matudae Leonard, 1941 |
| Ruellia maya T.F. Daniel, 1995 |
| Ruellia mcvaughii T.F. Daniel, 1990 |
| Ruellia megasphaera Lindau, 1895 |
| Ruellia metziae Tharp, 1949 |
| Ruellia mirandana Ramamoorthy & Hornelas, 1988 |