Rock Geranium (spp.) Rock Geranium 'Ruby Veil'
Rock Maple (spp.) Rock Maple 'Ann Rutledge'
Rock Maple 'Arrowhead' Rock Maple 'Coleman'
Rock Maple 'Commemoration' Rock Maple 'Eagle Claw'
Rock Maple 'Endowment' 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' Rock Spiraea
Rockberry Rockcress (spp.)
Rockcress 'Skyrocket' Rockcress, Fringed 'Spring Charm'
Rockfoil Rocky Mountain Columbine (spp.)
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 'Horizontalis'
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 'Repens'
Rocky Mountain Juniper 'Silver King' 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 Penstemon 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 Rocky Mountain Zinnia
'Rocky Point' Western Blue-eyed Grass 'Rodeo Lagoon' Buck Brush
'Rodeo Lagoon' Ceanothus 'Rodeo Lagoon' Redroot
Roman Candle (spp.) Roman Candle Variegated
Roman Wormwood 'Rondo' Bearded Tongue
Rose Acacia Rose Bay: maximum (spp.)
Rose Bay: maximum 'Golden Lights' Rose Bay: maximum 'Great Laurel'
Rose Bay: maximum 'Mandrin Lights' Rose Mallow (spp.)
Rose Mallow 'Southern Belle' 'Rose Serenade' Bushy Aster
Rose Spirea Rose Tuna Cactus
Rose Turtlehead Rose Verbena 'Rosea'
Rose Vervain 'Rosea' Rose, California Wild
Rose, Virginia Rose, Virginia Swamp
Rose, White Mexican 'Rosea' American Yellow Wood
'Rosea' Clump Verbena 'Rosea' Flowering Dogwood
'Rosea' Pink Evening Primrose 'Rosea' Summer Sweet
Rosebay Catawba (spp.) Rosebay Catawba 'Boursault'
Rosebay Catawba White Rosebay Laurel (spp.)
Rosebay Laurel 'Boursault' Rosebay Laurel White
Rosebay Rhododendron (spp.) Rosebay Rhododendron 'Golden Lights'
Rosebay Rhododendron 'Great Laurel' Rosebay Rhododendron 'Mandrin Lights'
Rosebay, Mountian (spp.) Rosebay, Mountian 'Boursault'
Rosebay, Mountian White Rosebud Salvia (spp.)
'Rosehill' White Ash Roseleaf Sage (spp.)
Rosemallow, Common (spp.) Rosemallow, Common 'Southern Belle'
Rosemallow, Eastern (spp.) Rosemallow, Eastern 'Southern Belle'
Rosemallow, Swamp (spp.) Rosemallow, Swamp 'Southern Belle'
Rosemary, Bog 'Blue Ice' Rosemary, Bog 'Grandiflora Compacta'
Rosewood, Arizona