'Rosy Cushion' Rose 'Rosy Tips' White Bottlebrush
'Rotunda' Chinese Holly 'Rotundifolia' Flowering Ash
'Rotundifolia' Japanese Holly 'Rotundifolium' Doublefile Viburnum: plicatum
'Rotundiloba' Sweetgum Rough Honey Myrtle
Round Leaf Birch Round Leaf Chastetree (spp.)
Round Leaf Chastetree 'Wild Korea' Round Leaf Holly
Round Leaf Tea Tree Round Leaf Vitex (spp.)
Round Leaf Vitex 'Wild Korea' Round-fruited Banksia
Roundleaf Buffaloberry Round-leaf Fan Palm
Round-leaf Hawthorn Roundleaf Holly Osmanthus
Roundleaf Livistona Rowe Ceanothus 'Gerda Isenberg'
Roxburgh Fig 'Royal Burgundy' Oriental Cherry
'Royal Cape' Cape Leadwort 'Royal Crown' Magnolia
'Royal Dwarf' Sheep Laurel Royal Palm
Royal Palm: spp. Royal Paulownia
Royal Poinciana Royal Purple Brunfelsia (spp.)
Royal Purple Brunfelsia 'Macrantha' 'Royal Purple' Smoke Tree
'Royal Red' Norway Maple 'Royal Star' Star Magnolia
'Royal White' Eastern Redbud 'Royalty' Crapemyrtle: indica
'Royalty' Hungarian Lilac 'Royle' Japanese Maple
'Rozalea® Coral Pink' Azalea 'Rozalea® Light Lavender' Azalea
'Rozannie' Aucuba Rubber Euphorbia 'Red Pencil Tree'
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
'Rubis' Rose of Sharon 'Rubra' Star Magnolia
'Rubriflora' Stachyurus 'Rubro-petiolata' Red Horsechestnut
Rubus (spp.) Rubus 'Emerald Carpet'
Rubus: trifidus 'Ruby Anniversary™' Glossy Abelia
'Ruby' Azalea 'Ruby Clusters' Spider Flower
'Ruby Glow' Garland Daphne 'Ruby Glow' Witchhazel: intermediahybrid
'Ruby' Katsura Tree 'Ruby Kins' Old Fashioned Weigela
'Ruby Meidiland®' Rose Ruby Red Horsechestnut (spp.)
Ruby Red Horsechestnut 'Briotii' Ruby Red Horsechestnut 'Rubro-petiolata'
'Ruby Spice' Summer Sweet 'Ruby Teardrops' Colorado Spruce
'Rudy Haag' Burning Bush Ruellia, Sonoran Desert
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
'Ruhn Von Horstenstein' Common Lilac 'Rumba' Old Fashioned Weigela
Running Strawberry Bush