R – R
| Ranunculus ficaria | Lesser Calendine, Pilewort |
| Rhamnus catharticus | Buckthorn, Common Buckthorn |
| Rhamnus frangula | Alder Buckthorn |
| Rhus cotinus | Smoke tree |
| Ribes nigrum | Blackcurrant |
| Robinia pseudoacacia | Black locust, false acacia |
| Rosa canina | Dog rose |
| Rosa centifolia | Provence rose |
| Rosmarinus officinalis | Rosemary |
| Rubia tinctorum | Common madder |
| Rubus caesius | European dewberry |
| Rubus idaeus | Red raspberry |
| Rumex obtusifolius | Sorrel |
| Ruta hortensis (Ruta graveolens L.) | Rue, Herb of Grace |