| 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 |
| Hydrangea paniculata 'Ruby Spice' | Ruby Spice panicle hydrangea | | Hydrangea paniculata Collection (all of Cornell campus), Hydrangea Paniculata @ Minns Garden | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 5a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Hydrangea paniculata 'Ruby Snow' | Ruby Snow Panicle Hydrangea | | Hydrangea paniculata Collection (all of Cornell campus), Hydrangea paniculata @ Friedman Wrestling Center | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 5a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Rhododendron schlippenbachii | Royal Azalea | | | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 4a, Requires acid (pH 5.0 to 7.0) |
| Salix eleagnos | Rosemary Willow | | | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Salix eleagnos | Rosemary Willow | | Wet Site Plants | Shrub > 8 feet, Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Rhododendron maximum | Rosebay Rhododendron | | Broad-leaved Evergreens | Shrub > 8 feet, Evergreen, Part shade, Shade, Zone 3b, Requires acid (pH 5.0 to 7.0) |
| Hibiscus syriacus | Rose-of -Sharon; Shrub Althaea | | High pH | Shrub > 8 feet, Deciduous, Full sun, Part shade, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Robinia hispida | Rose Acacia; Bristly Locust | | | Shrub > 8 feet, Deciduous, Zone 4b |
| Rosa spp. | Rose | | Zone 6 & 7 Plants plus shrubs | Shrub 4 to 8 feet, Shrub < 4 feet, Deciduous, Full sun, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Abies lasiocarpa | Rocky Mountain Fir; Alpine Fir; Subalpine Fir | | None Listed | Evergreen, Zone |
| Cotoneaster horizontalis | Rockspray; Rock Cotoneaster | | | Shrub < 4 feet, Groundcover, Deciduous, Full sun, Part shade, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Betula nigra | River Birch; Red Birch | | Birch, Larch, Magnolias and Nut Trees at Arboretum | Tree > 30 feet, Tree < 30 feet, Deciduous, Full sun, Zone 3b, Can tolerate acid to neutral soil (pH 5.0 to 7.4), Tolerates salty soil |
| Hydrangea paniculata 'Revival Honeycomb'™ | Revival Honeycomb Panicle Hydrangea | | Hydrangea paniculata Collection (all of Cornell campus), Hydrangea Paniculata @ Botanic Gardens | Shrub 4 to 8 feet, Full sun, Part shade, Shade, Zone 3b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Quercus robur x bicolor 'Long' | Regal Prince | | None Listed | Tree > 30 feet, Deciduous, Full sun, Part shade, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Enkianthus campanulatus | Redvein Enkianthus | | None Listed | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 5b, Requires acid (pH 5.0 to 7.0) |
| Cornus sericea or alba | Red Twig Dogwood; Redosier Dogwood; Tatarian Dogwood | | Cornus, Viburnum, and Friends - Winter Identification, Dogwood & Common Shrubs; Cornus, Viburnum, and Friends - Winter Identification; Dogwood & Common Shrubs | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 3a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salt spray |
| Pinus resinosa | Red Pine | | Pines et. al. | Tree > 30 feet, Evergreen, Full sun, Zone 3a, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
| Quercus rubra | Red Oak; Northern Red Oak | | Oaks , Campus trees walk; Big Trees in Winter | Tree > 30 feet, Deciduous, Full sun, Zone 3b, Can tolerate acid to neutral soil (pH 5.0 to 7.4), Tolerates salty soil |
| Acer rubrum | Red Maple; Scarlet Maple; Swamp Maple | | Maples, Beeches and Others, Campus trees walk; Big Trees in Winter; Maples, Beeches and Others | Tree > 30 feet, Deciduous, Full sun, Zone 3b, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |