| Common name (English) | |
|---|---|
| Reseda phyteuma | Corn Mignonette |
| Retama monosperma | Bridal broom |
| Retama raetam | White Broom, White weeping broom |
| Rhizobium radiobacter | |
| Rhododendron | Rhododenron |
| Ribes rubrum | European red currant |
| Ribes uva-crispa | English gooseberry |
| Ricinus communis | Castor bean, Castor |
| Rosa gallica | Apothecary Rose |
| Rosa noisettiana | Noisette Rose |
| Rosa × damascena | Damask rose |
| Salix babylonica | Babylon Weeping Willow |
| Salvia aethiopis | African sage |
| Salvia officinalis | Common Sage |
| Sambucus ebulus | Danewort |
| Sapindus mukorossi | Chinese soapberry, North Indian Soapnut |
| Sapium stylare | |
| Saponaria officinalis | bouncing bet |
| Saponaria sicula | |
| Schinus molle | American pepper, California peppertree |