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| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Latin Names | Common Names | Families |
| Reseda lutea | Mignonette | Resedaceae |
| Rheum rhabarbarum | Rhubarb | Polygonaceae |
| Rhododendron spp. | Rhododendron | Ericaceae |
| Rhodotypos scandens | Jetbead | Rosaceae |
| Ribes odoratum | Clove Currant | Saxifragaceae |
| Ricinus communis | Castor Bean | Euphorbiaceae |
| Rodgersia pinnata | Rodgersia | Saxifragaceae |
| Rosa 'Meipotal' | Rose | Rosaceae |
| Rosa 'Henry Kelsey' | Climbing Rose | Rosaceae |
| Rudbeckia fulgida & R. hirta | Coneflower & Black-Eyed Susan | Asteraceae |
| Ruta graveolens | Common Rue | Rutaceae |
