| Rapistrum rugosum |
| Reichardia intermedia |
| Reseda gredensis |
| Reseda lutea |
| Reseda luteola |
| Reseda phyteuma |
| Reseda stricta |
| Reseda suffruticosa |
| Reseda undata |
| Reseda virgata |
| Rhagadiolus stellatus |
| Rhamnus lycioides L. subsp. laderoi |
| Rhamnus lycioides L. subsp. lycioides |
| Rhamnus oleoides subsp. assoana |
| Rhamnus pumila subsp. pumila |
| Rhamnus x colmeiroi |
| Rhaponticum coniferum |
| Rhinanthus minor |
| Rhus coriaria |
| Ridolfia segetum |
| Rochelia disperma |
| Roemeria hybrida |
| Romulea bulbocodium |
| Rosa agrestis |
| Rosa andegavensis |
| Rosa canina |
| Rosa corymbifera |
| Rosa micrantha |
| Rosa moschata |
| Rosa pimpinellifolia
|
| Rosa sempervirens |
| Rosa sicula
|
| Ruscus aculeatus |
| Ruta angustifolia |