| Ramonda (many) |
Phoenix Flower |
 |
| Ramonda serbica |
Serbian Phoenix Flower |
 |
| Ranunculus acris |
Field Buttercup |
 |
| Ranunculus asiaticus hybrids |
Persian Buttercup |
|
| Ranunculus ficaria |
Lesser Celandine |
 |
| Raoulia australis |
Vegetable Sheep |
|
| Raoulia glabra |
Vegetable Sheep |
|
| Ratibida columnifera |
Prarie Coneflower, Mexican Hat |
 |
| Ravenala madagascariensis |
Traveller's Tree |
|
| Reseda lutea |
Wild Mignonette |
|
| Reseda luteola |
Weld, Dyer's Greenweed |
|
| Rhaphiolepis umbellata |
Japanese Hawthorn |
|
| Rhodochiton atrosanguineus |
Purple Bell Vine |
|
| Rhodohypoxis baurii |
Rhodohypoxis |
|
| Rhodophiala andicola |
Hardy Amaryllis |
|
| Ricinus communis |
Castor Oil Plant, Castor Bean |
|
| Ricinocarpus pinifolius |
Wedding Bush |
|
| Robinia hispida v fertilis |
Bristly Locust |
|
| Robinia pseudoacacia |
False Acacia |
|
| Rodgersia aesculifolia |
Rodgersia |
|
| Romanzoffia |
Mistmaiden |
|
| Romneya coulteri |
Matilija Poppy |
|
| Romulea (many) |
Onion Grass |
|
| Romulea bulbocodium |
Romulea |
|
| Roscoea (many) |
Roscoea |
|
| Roscoea scillifolia |
Roscoea |
|
| Roscoea tibetica |
Tibetan Ginger |
|
| Rosmarinus officinalis |
Rosemary |
 |
| Roystonia altissima |
Royal Palm |
|
| Rudbeckia fulgida |
Coneflower |
|
| Rubus fruticosus |
Blackberry |
|
| Rudbeckia hirta |
Black-eyed Susan |
|
| Ruellia tuberosa |
Fever Root |
|
