'Rosi Klose' Bergenia Rosilla
Rosinweed: perfoliatum 'Rosish One' Carnation: Dianthus
Rosularia 'Rosylva' Forget-me-not
'Rotblum' Heartleaf Bergenia 'Rote Glocke' Pasque Flower
'Rothschildiana' Glory Lily 'Rotstrahlbusch' Switch Grass
'Rotundatum Cristatum' English Hedge Fern Rough Bluegrass
Rough Cocklebur Rough Horsetail
Rough Seeded California Poppy Rough-Leaved Goldenrod 'Fireworks'
Rough-Stalk Bluegrass Roughstem Goldenrod 'Fireworks'
Round Head Bush Clover Round Headed Leek
Round Leaf Navel Wort Round Lobed Hepatica
Roundleaf Greenbrier Roundleaf Oregano
Royal Agave 'Royal Aspirations' English Larkspur
'Royal Burgundy' Bromeliad: hybrid Royal Fern (spp.)
Royal Fern 'Purpurescens' Royal Fern: regalis spectabilis
Royal Mallow (spp.) Royal Mallow 'Novella'
'Royal Mix' Garden Pea Royal Purple Autumn Sage
'Royal Purple' Lilyturf 'Royal Robe' Germander
'Royal Robe' Wood Sage 'Royal Standard' Common Torch Lily: Kniphofia
'Royal Standard' Hosta 'Royal Wedding' Oriental Poppy
'Rozanne' Hybrid Geranium Rubber Plant, Baby (spp.)
Rubber Plant, Baby Variegated Rubber Plant, Japanese Variegated
'Rubiginosa' Joseph's Coat: dentata 'Rubra' Cut-leaf Anemone
'Rubra Flora Plena' Fernleaf Peony 'Rubra' Fringecup
'Rubra' Japanese Blood Grass 'Rubra' Pussytoes
'Rubra' Windflower 'Rubrifolia' Plantain: major
'Rubrum' Alpine Epimedium 'Rubrum' Fennel
'Rubrum' Fountain Grass: setaceum 'Rubrum' Oriental Lily
'Rubrum' Trillium 'Ruby Cluster' Everlasting
'Ruby Gardner' Sacred Lotus 'Ruby Glow' Star Cluster
'Ruby' Joseph's Coat: dentata 'Ruby Meyer' Amaryllis: Hippeastrum
'Ruby Moon' Hyacinth Bean 'Ruby Star' Purple Coneflower
'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 Rue Anemone (spp.)
Rue Anemone, False Rue, Garden (spp.)
Ruellia, Baja Ruellia, Desert
Ruellia, Red (spp.) Ruellia, Red 'Ragin Cajin'
Ruellia, Violet 'Ruffled Apricot' Daylily
'Ruffled Ruby' Daylily 'Ruffles' Alumroot: micrantha
Runaway Robin (spp.) Runaway Robin Variegated
'Running Tapestry' Heartleaf Foamflower Rupturewort
Ruscus