| Rosa rugosa | Rugosa Rose; Saltspray Rose; Beach Tomato; Japanese/Ramanas Rose | | Zone 6 & 7 Plants plus shrubs | Shrub 4 to 8 feet, Deciduous, Full sun, Zone 3a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salt spray, Tolerates salty soil |
| Rosa palustris | Swamp Rose | | None Listed | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 4a, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
| Rosa multiflora | Multiflora Rose | | Native and Invasive Plants | Shrub 4 to 8 feet, Deciduous, Full sun, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Rosa hugonis | Father Hugo's Rose | | None Listed | Shrub 4 to 8 feet, Deciduous, Full sun, Zone 5a, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
| Robinia pseudoacacia | Black Locust | | Native and Invasive Plants | Tree > 30 feet, Tree < 30 feet, Deciduous, Full sun, Zone 4b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salty soil |
| Robinia hispida | Rose Acacia; Bristly Locust | | | Shrub > 8 feet, Deciduous, Zone 4b |
| Ribes alpinum | Alpine Currant | | | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 3b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Rhus typhina | Staghorn Sumac | | Native and Invasive Plants | Shrub > 8 feet, Deciduous, Full sun, Part shade, Zone 3b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Rhus copallina ( Rhus coppalinum) | Flameleaf Sumac, Shining Sumac | | Native and Invasive Plants | Shrub > 8 feet, Deciduous, Full sun, Zone 4b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salt spray |
| Rhus aromatica | Fragrant Sumac | | Flowering Landscape Shrubs; Cornus, Viburnum, and Friends - Winter Identification | Shrub 4 to 8 feet, Groundcover, Deciduous, Full sun, Zone 3a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Rhodotypos scandens | Jetbead | | Dogwood & Common Shrubs | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 5a, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
| Rhododendron yakushimanum | Yakushima Rhododendron | | Broad-leaved Evergreens | Shrub 4 to 8 feet, Evergreen, Part shade, Zone 5a, Requires acid (pH 5.0 to 7.0) |
| Rhododendron schlippenbachii | Royal Azalea | | | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 4a, Requires acid (pH 5.0 to 7.0) |
| Rhododendron mucronulatum | Korean Rhododendron; Korean Azalea | | Low pH | Shrub 4 to 8 feet, Deciduous, Part shade, Zone 5a, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
| Rhododendron maximum | Rosebay Rhododendron | | Broad-leaved Evergreens | Shrub > 8 feet, Evergreen, Part shade, Shade, Zone 3b, Requires acid (pH 5.0 to 7.0) |
| Rhododendron catawbiense | Catawba Rhododendron | | Broad-leaved Evergreens | Shrub 4 to 8 feet, Evergreen, Part shade, Zone 4a, Requires acid (pH 5.0 to 7.0) |
| Rhododendron 'P.J.M.' | P.J.M. Rhododendron | | Broad-leaved Evergreens | Shrub 4 to 8 feet, Evergreen, Full sun, Part shade, Shade, Zone 5a, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
| Rhamnus cathartica | Common Buckthorn | | Native and Invasive Plants | Shrub > 8 feet, Deciduous, Full sun, Part shade, Zone 3b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Quercus X Warei 'Long' open | 06-1500-3 | | Hybrid Oaks on Campus | Tree > 30 feet, Deciduous, Full sun, Zone , Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Quercus x warei 'Long' open | 06-1500-7 | | Hybrid Oaks on Campus | Tree > 30 feet, Deciduous, Full sun, Zone , Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |