Plants Ra to Ro
Raphiolepsis umbellata | Yeddo Hawthorn. Originated in … Japan | Shrub
Ratibida columnifera | Upright Prairie Coneflower, Mexican Hat | Flower
Ratibida pinnata | Pinnate Prairie Coneflower, Gray-Headed Coneflower | Flower
Rauvolfia serpentina | Serpentine Wood, Sarpagandha, Indian Snakeroot | Various
Rauvolfia vomitoria | Poison Devil'S-Pepper | Various
Rauwenhoffia siamensis | . Originated in … Thailand | Various
Rehmannia elata | Rehmannia, Chinese Foxglove. Originated in … China | Shrub
Rehmannia glutinosa | Di Huang, Chinese Foxglove, Rehmannia | Various
Reineckea carnea | . Originated in … China,Japan | Various
Reseda alba | White Upright Mignonette | Various
Reseda glauca | Hardy Mignonette. Originated in … Pyrenees;Pyrenees (Spain) | Flower
Reseda lutea | Yellow Mignonette, Wild Mignonette | Various
Reseda luteola | Weld, Dyer'S Mignonette. Originated in … Eire;Mediterranean | Various
Reseda odorata | Mignonette, Little Darling | Various
Rhamnus californica | California Coffeeberry | Various
Rhamnus cathartica | Common Buckthorn | Shrub
Rhamnus crocea | Red Berry | Various
Rhamnus frangula | Trollhegg, Alder Buckthorn. Originated in … Norway | Shrub
Rhamnus tinctoria | Dyer'S Buckthorn. Originated in … Greece | Various
Rheum nobile | Rhubarb, Chucha, Bushing | Various
Rheum palmatum | Chinese Rhubarb, Da Huang | Various
Rheum rhabarbarum | Rhubarb | Various
Rheum rhaponticum | Rhubarb, Pieplant | Various
Rheum x cultorum | Common Rhubarb | Flower
Rhexia mariana | Maryland Meadow Beauty. Originated in … Eastern US | Various
Rhexia virginica | Virginia Meadow Beauty, Deer Grass. Originated in … Eastern US | Various
Rhizophora mangle | American Mangrove, Red Mangrove. Originated in … Bahamas | Various
Rhodiola | Stonecrop, Rosewood | Flower
Rhodochiton atrosanguineum | Purple Bell Vine. Originated in … Mexico | Flower
Rhododendron | Rhododendron | Shrub
Rhododendron anthopogon | Azalea. Originated in … the Himalayas | Shrub
Rhododendron arborescens | Azalea. Originated in … Eastern US | Shrub
Rhododendron austrina | Flame Azelea. Originated in … Florida | Shrub
Rhododendron canescens | Mountain Azelea. Originated in … North Carolina | Shrub
Rhododendron decorum | Rhododendron. Originated in … China | Shrub
Rhododendron edgeworthii | Rhododendron. Originated in … the Himalayas | Shrub
Rhododendron falconeri | Rhododendron. Originated in … the Himalayas | Shrub
Rhododendron fortunei | Rhododendron. Originated in … China | Shrub
Rhododendron griffithianum | Rhododendron. Originated in … the Himalayas | Shrub
Rhododendron houlstonii | Rhododendron | Shrub
Rhododendron japonicum | Japanese Azalea. Originated in … Japan | Various
Rhododendron maximum | Great Laurel, Rhododendron. Originated in … United States | Various
Rhododendron minus | Piedmont Rhododendron. Originated in … Southeast US | Shrub
Rhododendron moupinense | Rhododendron. Originated in … Tibet | Shrub
Rhododendron 'Mrs. T. H. Lowinsky' | | Shrub
Rhododendron nudiflora | Pinxter Flower. Originated in … Eastern US | Shrub
Rhododendron occidentalis | Azalea. Originated in … Western United States | Shrub
Rhododendron 'Purple Splendour' | | Shrub
Rhododendron serrulata | Azalea. Originated in … Southern US | Shrub
Rhododendron sinonuttallii | Rhododendron. Originated in … Chinese | Shrub
Rhododendron spp. | Rhododendron, Rose Bay. Originated in … Pacific Coast US | Shrub
Rhododendron viscosa | White Swamp Honeysuckle. Originated in … Eastern US | Shrub
Rhododendron viscosum | Swamp Azalea | Shrub
Rhododendron 'Vulcan' | | Shrub
Rhododendron wilsoni | Rhododendron. Originated in … Hupeh (China) | Shrub
Rhus aromatica | Fragrant Sumac | Shrub
Rhus chinensis | Sumac. Originated in … Japan | Various
Rhus copallinum | Shining Sumac, Flaming Sumac | Shrub
Rhus coriaria | Sicilian Sumac, Dyer'S Sumac. Originated in … Europe | Various
Rhus glabra | Smooth Sumac. Originated in … North America | Shrub
Rhus javanica | Sumac | Various
Rhus spp. | Sumac, Chii Chin, Skunk Bush, Green Sumac. Originated in … North America | Tree
Rhus succedanea | Wax-Tree, Redlac Sumac. Originated in … Japan | Various
Rhus trichocarpa | Japanese Sumac. Originated in … Japan | Various
Rhus trilobata | Skunk Bush | Various
Rhus typhina | Staghorn Sumac | Shrub
Rhus vernix | Poisonous Sumac | Various
Rhynchelytrum repens | Champagne Grass | Grass
Ribes | Currant, Worcesterberry | Shrub
Ribes alpinum | Alpine Currant | Shrub
Ribes americanum | American Black Currant | Shrub
Ribes aureum | Flowering Currant. Originated in … Central US | Shrub
Ribes glutinosum | Incense Shrub. Originated in … the US Coast Ranges | Various
Ribes hirtellum | Currant Gooseberry, American Gooseberry | Shrub
Ribes hudsonianum | Black Currant. Originated in … Northwest US | Various
Ribes laxiflorum | Trailing Black Currant, Skunk Currant | Various
Ribes nevadense | Sierra Currant | Various
Ribes nidigrolaria | Jostaberry | Shrub
Ribes nigrum | European Black Currant | Shrub
Ribes oxyacanthoides | | Shrub
Ribes petraeum | Currant | Shrub
Ribes prostratum | Stink Currant | Various
Ribes rubrum | Red Currant | Shrub
Ribes sanguineum | Flowering Currant. Originated in … Pacific Coast US;Central US | Shrub
Ribes sativum | White Currant | Shrub
Ribes speciosum | Fuchsia-Flowered Gooseberry | Shrub
Ribes spp. | Currant | Various
Ribes uva-crispa | European Gooseberry | Shrub
Ricinus communis | Castor Bean, Castor-Oil Plant | Shrub
Robinia pseudoacacia | Black Locust, Honey Locust | Tree
Roccella tinctoria | Orseille, Lichen. Originated in … Morocco | Various
Rochea odoratissima | . Originated in … South Africa | Various
Rodgersia aesculifolia | Fingerleaf Rodgersia, Fingerleaf Rodgersflower | Various
Rodgersia pinnata | Featherleaf Rodgersia | Flower
Rodgersia podophylla | Bronze-Leaf Rodgersia, Bronzeleaf Rodgersflower | Various
Rodriguezia venusta | Epiphytic Orchid. Originated in … Brazil | Various
Rondeletia gratissima | . Originated in … Mexico | Various
Rondeletia laurifolia | . Originated in … Jamaica | Various
Rondeletia odorata | . Originated in … Cuba,Mexico | Various
Rondeletia purdiei | . Originated in … Columbia | Various
Rosa alba | White Rose | Shrub
Rosa alpina | Thornless Rose. Originated in … the European Alps | Shrub
Rosa arkansana | Rose. Originated in … central US | Shrub
Rosa arvensis | Field Rose | Shrub
Rosa banksiae | Banksian Rose, Lady Bank'S Rose. Originated in … China | Vine
Rosa beggeriana | . Originated in … Afghanistan | Shrub
Rosa blanda | Meadow Rose | Shrub
Rosa bracteata | Macartney Rose. Originated in … China,India | Shrub
Rosa brunonii | Himalayan Musk Rose | Shrub
Rosa californica | California Wild Rose | Shrub
Rosa canina | Dog Rose | Shrub
Rosa cathayensis | Rose. Originated in … China | Shrub
Rosa centifolia | Hundred-Leaved Rose, Cabbage Rose, Provence Rose | Shrub
Rosa cinnamomea | Cinnamon Rose | Shrub
Rosa damascena | Damask Rose | Shrub
Rosa ecae | . Originated in … central Asia | Shrub
Rosa gallica | French Rose | Shrub