Rubber Euphorbia 'Red Pencil Tree' Rubber Plant, Baby (spp.)
Rubber Plant, Baby Variegated Rubber Plant, Japanese Variegated
Rubber Plant, Small-leaved (spp.) Rubber Plant, Small-leaved 'Indigo'
Rubber Plant, Small-leaved 'Jacqueline' Rubber Plant, Small-leaved 'Monique'
Rubber Plant, Small-leaved 'Spire' Rubber Plant, Small-leaved Variegated
Rubber Tree (spp.) Rubber Tree 'Decora'
Rubber Tree 'Doescheri' Rubber Tree, Hardy
Rubber Tree, India (spp.) Rubber Tree, India 'Decora'
Rubber Tree, India 'Doescheri' 'Rubella' Japanese Skimmia
'Rubicon' Rhododendron: hybrid 'Rubidor' Old Fashioned Weigela
'Rubiginosa' Joseph's Coat: dentata 'Rubis' Rose of Sharon
'Rubra' Cut-leaf Anemone 'Rubra Flora Plena' Fernleaf Peony
'Rubra' Fringecup 'Rubra' Japanese Blood Grass
'Rubra' Pussytoes 'Rubra' Star Magnolia
'Rubra' Windflower 'Rubriflora' Stachyurus
'Rubrifolia' Plantain: major 'Rubro-petiolata' Red Horsechestnut
'Rubrum' Alpine Epimedium 'Rubrum' Fennel
'Rubrum' Fountain Grass: setaceum 'Rubrum' Oriental Lily
'Rubrum' Trillium Rubus (spp.)
Rubus 'Emerald Carpet' Rubus: trifidus
'Ruby Anniversary™' Glossy Abelia 'Ruby' Azalea
'Ruby Cluster' Everlasting 'Ruby Clusters' Spider Flower
'Ruby Gardner' Sacred Lotus 'Ruby Glow' Garland Daphne
'Ruby Glow' Star Cluster 'Ruby Glow' Witchhazel: intermediahybrid
'Ruby' Joseph's Coat: dentata 'Ruby' Katsura Tree
'Ruby Kins' Old Fashioned Weigela 'Ruby Meidiland®' Rose
'Ruby Meyer' Amaryllis: Hippeastrum 'Ruby Moon' Hyacinth Bean
Ruby Red Horsechestnut (spp.) Ruby Red Horsechestnut 'Briotii'
Ruby Red Horsechestnut 'Rubro-petiolata' 'Ruby Spice' Summer Sweet
'Ruby Star' Purple Coneflower 'Ruby Teardrops' Colorado Spruce
'Ruby Throat' Daylily 'Ruby Veil' Rock Geranium
Ruddles (spp.) Ruddles 'Alpha'
Ruddles 'Ball's Gold' Ruddles 'Bon Bon Apricot'
Ruddles 'Bon Bon Orange' Ruddles 'Bon Bon Yellow'
Ruddles 'Coffee Cream' Ruddles 'Fiesta Gitana'
Ruddles 'Greenheart Orange' Ruddles 'Indian Prince'
Ruddles 'Kablouna' Ruddles 'Pacific Beauty'
Ruddles 'Pink Surprise' Ruddles 'Porcupine'
Ruddles 'Princess Black Centered Orange' Ruddles 'Resina'
'Rudolph Roehrs' Spotted Dumbcane 'Rudy Haag' Burning Bush
Rue Anemone (spp.) Rue Anemone, False
Rue, Garden (spp.) Ruellia, Baja
Ruellia, Desert Ruellia, Red (spp.)
Ruellia, Red 'Ragin Cajin' Ruellia, Sonoran Desert
Ruellia, Violet 'Ruffled Apricot' Daylily
'Ruffled Ruby' Daylily 'Ruffles' Alumroot: micrantha
Rugose Rose (spp.) Rugose Rose 'Agnes'
Rugose Rose 'Dart's Dash' Rugose Rose 'La Marne'
Rugose Rose 'Magnifica' Rugose Rose 'Red Dagmar'
Rugose Rose White 'Rugosum' Wayfaring Tree