| Roldana schaffneri (Sch. Bip. ex Klatt) H. Rob. & Brettell, 1974 |
| Roldana sessilifolia (Hook. & Arn.) H. Rob. & Brettell, 1974 |
| Roldana sinuata B.L. Turner, 2006 |
| Roldana subcymosa H. Rob., 1975 |
| Roldana subpeltata (Sch. Bip.) H. Rob. & Brettell, 1974 |
| Roldana suffulta (Greenm.) H. Rob. & Brettell, 1974 |
| Roldana sundbergii (B.L. Turner) B.L. Turner, 1996 |
| Roldana tepopana (B.L. Turner) B.L. Turner, 2006 |
| Roldana tlacotepecana Funston, 2001 |
| Roldana tonii (B.L. Turner) B.L. Turner, 2006 |
| Roldana uxordecora Quedensley & Villaseñor, 2009 |
| Rosalesia La Llave & Lex., 1824 |
| Rosalesia glandulosa La Llave, 1824 |
| Rosilla Less., 1832 |
| Rosilla lutea Less., 1832 |
| Rudbeckia L., 1753 |
| Rudbeckia columnifera Nutt., 1813 |
| Rudbeckia laciniata L., 1753 |
| Rudbeckia leucantha Lag., 1816 |
| Rudbeckia tagetes L.E. James, 1823 |