Roble Beech Roble Guayo
Robust Acacia Rock Grevillea
Rock Maple (spp.) Rock Maple 'Ann Rutledge'
Rock Maple 'Arrowhead' Rock Maple 'Celebration'
Rock Maple 'Coleman' Rock Maple 'Commemoration'
Rock Maple 'Eagle Claw' Rock Maple 'Endowment'
Rock Maple 'Fairview' Rock Maple 'Globosum'
Rock Maple 'Goldspire' Rock Maple 'Legacy'
Rock Maple 'Newton Sentry' Rock Maple 'Seneca Chief'
Rock Maple 'Skybound' Rock Maple 'Sweet Shadow'
Rock Maple 'Temple's Upright' Rock Palm (spp.)
Rock Palm 'Elegans' 'Rockanje' White Willow
Rockingham Podocarp Rocky Mountain Fir 'Compacta'
Rocky Mountain Juniper (spp.) Rocky Mountain Juniper 'Chandler's Blue'
Rocky Mountain Juniper 'Gray Gleam' Rocky Mountain Juniper 'Holmes Silver'
Rocky Mountain Juniper 'Medora' Rocky Mountain Juniper 'Minima'
Rocky Mountain Juniper 'Moonglow' Rocky Mountain Juniper 'Moonlight'
Rocky Mountain Juniper 'Pathfinder' Rocky Mountain Juniper 'Platinum'
Rocky Mountain Juniper 'Rependens' Rocky Mountain Juniper 'Skyrocket'
Rocky Mountain Juniper 'Tolleson's Green Weeping' Rocky Mountain Juniper Weeping
Rocky Mountain Juniper 'Wichita Blue' Rocky Mountain Maple
Rocky Mountain Pinyon Rocky Mountain Pinyon Pine
Rocky Mountain Scrub Oak Rocky Mountain White Oak
Rocky Mountain White Pine (spp.) Rocky Mountain White Pine Blue
Roman Cassie Rootspine Palm
Rose Apple Rose Apple, Coolamon
Rose Apple: malaccense Rose Eucalyptus
Rose Gum Rose Satinash
Rose Tamarind Rose, China 'TieDye Wind'
Rose, Dowerin 'Rosea' American Yellow Wood
'Rosea' Flowering Dogwood 'Rosea' Mimosa
'Rosea' Red Ironbark 'Rosea' Star Magnolia
Rosebud Cherry (spp.) Rosebud Cherry 'Autumnalis'
Rosebud Cherry 'Tai-Haka' Rosebud Cherry Weeping
'Rosebud' Japanese Flowering Apricot 'Rosehill' White Ash
'Rosemary Clarke' Japanese Flowering Apricot Rose-of-China 'TieDye Wind'
Rosewood Rosewood, Burmese
Rosewood, Indian 'Rosy Tips' White Bottlebrush
'Rotundifolia' Flowering Ash 'Rotundiloba' Sweetgum
Round Leaf Birch Round Leaf Holly
Round-leaf Fan Palm Round-leaf Hawthorn
Roundleaf Livistona 'Royal Burgundy' Oriental Cherry
'Royal Crown' Magnolia Royal Palm
Royal Palm: spp. Royal Paulownia
Royal Poinciana 'Royal Red' Norway Maple
'Royal Star' Star Magnolia 'Royal White' Eastern Redbud
'Royle' Japanese Maple