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Rabbit Bush (Ambrosia deltoidea)
Rabbitear Iris (Iris laevigata)
Raceme Catmint (Nepeta racemosa)
Railroad Vine (Ipomoea pes-caprae)
Rain Daisy (Dimorphotheca pluvialis)
Rainbow Pink (Dianthus chinensis)
Rainlily (Zephyranthes atamasco)
Rambutan (Nephelium lappaceum)
Ramenas (Aloe longistyla)
Rampion Bellflower (Campanula rapunculoides)
Randramboay (Euphorbia lophogona)
Rangoon Creeper (Quisqualis indica)
Rankkopieva (Bulbine frutescens)
Rapunzel Plant (Sarcostemma viminale)
Rat Tail Cactus (Disocactus flagelliformis)
Rata (Garcinia dulcis)
Rattail Cactus (Mammillaria pottsii)
Rattail Crassula (Crassula muscosa)
Rattan Palm (Rhapis humilis)
Rattle Box (Sesbania punicea)
Rattlesnake Grass (Briza maxima)
Rattlesnake Master (Eryngium yuccifolium)
Rattlesnake Plant (Calathea insignis)
Rattlesnake Tail (Crassula barklyi)
Rattlesnake-Fern (Botrychium virginianum)
Red Alder (Alnus rubra)
Red Angel's Trumpet (Brugmansia sanguinea)
Red Ash (Fraxinus pennsylvanica)
Red Banana Red Abyssinian Banana (Ensete ventricosum)
Red Baneberry (Actaea rubra)
Red Barberry (Berberis haematocarpa)
Red Bauhinia (Bauhinia galpinii)
Red Bird of Paradise (Caesalpinia pulcherrima)
Red Boronia (Boronia heterophylla)
Red Buckeye (Aesculus pavia)
Red Buttons Opuntia (Opuntia quitensis)
Red Cap Gum (Eucalyptus erythrocorys)
Red Carpet (Crassula radicans)
Red Cat's Tail (Acalypha reptans)
Red Cestrum (Cestrum elegans)
Red Chokeberry (Photinia pyrifolia)
Red Clover (Trifolium pratense)
Red Columbine (Aquilegia formosa)
Red Columbine (Aquilegia canadensis)
Red Crown Cactus (Rebutia minuscula)
Red Elderberry (Sambucus callicarpa)
Red Fairy Duster (Calliandra californica)
Red Fescue (Festuca rubra)
Red Flax (Linum grandiflorum)
Red Flowering Gum (Eucalyptus ficifolia)
Red Ginger (Alpinia purpurata)
Red Granadilla (Passiflora coccinea)
Red Gum (Liquidambar styraciflua)
Red Gum (Eucalyptus camaldulensis ssp. obtusa)
Red Horsechestnut (Aesculus Χ carnea)
Red Hot Poker (Kniphofia uvaria)
Red Huckleberry (Vaccinium parvifolium)
Red Ironbark (Eucalyptus sideroxylon)
Red Jade Crabapple (Malus 'Red Jade')
Red Justicia (Justicia candicans)
Red Lungwort (Pulmonaria montana)
Red Maids (Calandrinia ciliata)
Red Maple (Acer rubrum)
Red Mombin (Spondias purpurea)
Red Mountain Sage (Salvia darcyi)
Red Mulberry (Morus rubra)
Red Oak (Quercus rubra)
Red Or Pink Calla (Zantedeschia rehmannii)
Red Osier Dogwood (Cornus sericea)
Red Passionflower (Passiflora coccinea)
Red Pine (Pinus resinosa)
Red Powderpuff (Calliandra haematocephala)
Red Puccoon (Sanguinaria canadensis)
Red Riding Hood (Mandevilla splendens)
Red Rocket (Russelia sarmentosa)
Red Root (Ceanothus herbaceus)
Red Shanks (Adenostoma sparsifolium)
Red Silky Oak (Grevillea banksii)
Red Snakebark Maple (Acer capillipes)
Red Spider Lily (Lycoris radiata)
Red Spike Ice Plant (Cephalophyllum alstonii)
Red Squill (Urginea maritima)
Red Stonecrop (Sedum moranense)
Red Tip Photinia (Photinia fraseri)
Red Torch Cactus (Echinopsis huascha)
Red Trillium (Trillium erectum)
Red Valerian (Centranthus ruber)
Red Yucca (Hesperaloe parviflora)
Redberry Buckthorn (Rhamnus crocea)
Redflower Buckwheat (Eriogonum grande var. rubescens)
Redflower Currant (Ribes sanguineum)
Red-flowered Mallee (Eucalyptus erythronema)
Red-Hot Cat Tail (Acalypha hispida)
Red-Leaf Hibiscus (Hibiscus acetosella)
Redondo Creeper (Lampranthus filicaulis)
Red-ribbons (Clarkia concinna)
Redspined Fishhook Cactus (Sclerocactus polyancistrus)
Red-spotted Gum (Eucalyptus mannifera ssp. maculosa)
Red-stemmed Filaree (Erodium cicutarium)
Redstemmed Lady's Mantle (Alchemilla erythropoda)
Redtop (Agrostis gigantea)
Redwood Insideout Flower (Vancouveria planipetala)
Redwood Sorrel (Oxalis oregana)
Reed Canarygrass (Phalaris arundinacea)
Reed Palm (Chamaedorea seifrizii)
Reeves' Meadowsweet (Spiraea cantoniensis)
Regal Geranium (Pelargonium domesticum)
Regal Lily (Lilium regale)
Reina de la Noche (Peniocereus serpentinus)
Reina de la Noche (Peniocereus greggii var. transmontanus)
Reina de la Noche (Peniocereus greggii)
Remembrance Columbine (Aquilegia hybrida cv. "Colorado Violet&White")
Renosterveld Bulbine (Bulbine alooides)
Resurrection Lily (Lycoris squamigera)
Retama Prieta (Senna polyphylla)
Retamo (Bulnesia retama)
Rex Begonia (Begonia rex)
Reynoutria (Polygonum cuspidatum)
Rhinoceros Cactus (Coryphantha cornifera)
Ribbon Fan Palm (Livistona decipiens)
Ribbon Grass (Phalaris arundinacea)
Ricepaper Plant (Tetrapanax papyriferus)
Rio Bravo Ranger (Leucophyllum langmaniae)
Rio Grande Copperlily (Habranthus tubispathus)
Rio Grande Globe Amaranth (Gomphrena haageana)
River Bell (Mackaya bella)
River Birch (Betula nigra)
River Red Gum (Eucalyptus camaldulensis ssp. camaldulensis)
River She-oak (Casuarina cunninghamiana)
River Wattle (Acacia cognata)
Road Kill Cactus (Consolea rubescens)
Robbin's Cory Cactus (Escobaria robbinsorum)
Robin Tree Cactus (Pilosocereus polygonus)
Robust Copperlily (Habranthus robustus)
Robust Hedgehog (Echinocereus fasciculatus)
Rock Cotoneaster (Cotoneaster horizontalis)
Rock Fig (Ficus palmeri)
Rock Live-forever (Dudleya saxosa ssp. collomiae)
Rock Penstemon (Penstemon baccharifolius)
Rock Purslane (Calandrinia umbellata)
Rock Soapwort (Saponaria ocymoides)
Rock Trumpet (Macrosiphonia brachysiphon)
Rockcress (Arabis alpina)
Rocket Candytuft (Iberis amara)
Rocket Pincushion (Leucospermum reflexum)
Rockrose (Cistus Χ purpureus)
Rockspray Cotoneaster (Cotoneaster microphyllus)
Rocky Mountain Blazing Star (Liatris ligulistylis)
Rocky Mountain Columbine (Aquilegia caerulea)
Rocky Mountain Maple (Acer glabrum)
Rocky Mountain Penstemon (Penstemon strictus)
Rocky Mountain White Oak (Quercus gambelii)
Rocky Mountain Zinnia (Zinnia grandiflora)
Rocky Point Ice Plant (Malephora luteola)
Rodgersia (Rodgersia pinnata)
Roman Chamomile (Chamaemelum nobile)
Roman Myrtle (Myrtus communis)
Roman Wormwood (Artemisia pontica)
Rooinaltjie (Lachenalia bulbiferum)
Rooiwortel (Bulbine latifolia)
Roosvygie (Lampranthus roseus)
Roquette (Eruca vesicaria ssp. sativa)
Rosa de Montana (Antigonon leptopus)
Rosary Plant (Crassula rupestris ssp. rupestris)
Rosary Vine (Ceropegia woodii)
Rose Apple (Eugenia jambos)
Rose Bay (Nerium oleander)
Rose Cactus (Pereskia grandifolia)
Rose Campion (Lychnis coronaria)
Rose Cone Flower (Isopogon formosus)
Rose Gold Pussy Willow (Salix gracilistyla)
Rose Mallee (Eucalyptus Χ rhodantha)
Rose of Heaven (Lychnis coeli-rosa)
Rose of Sharon (Hibiscus syriacus)
Rose of Venezuela (Brownea grandiceps)
Rose Pincushion Cactus (Mammillaria crinita f. zeilmanniana)
Rose Pinecone Flower (Porphyrocoma pohliana)
Rose Pink Zephyr Lily (Zephyranthes carinata)
Rose Plaid Cactus (Gymnocalycium quehlianum)
Rose Rockcress (Arabis blepharophylla)
Rose Silene (Silene coeli-rosa)
Rose Spirea (Spiraea douglasii)
Rosea Ice Plant (Drosanthemum hispidum)
Rosea Ice Plant (Drosanthemum floribundum)
Roseleaf Sage (Salvia involucrata)
Rosemary (Rosmarinus officinalis)
Rosemary Grevillea (Grevillea rosmarinifolia)
Rosemary Mint (Poliomintha longiflora)
Rosemary Mint (Poliomintha incana)
Rose-Scented Geranium (Pelargonium graveolens)
Rosette Aloe (Aloe pratensis)
Rosy Maidenhair (Adiantum hispidulum)
Rothschild Glory Lily (Gloriosa rothschildiana)
Rottnest Daisy (Trachymene coerulea)
Rough Barked Mexican Pine (Pinus montezumae)
Rough Blazing Star (Liatris scariosa)
Rough Bluegrass (Poa trivialis)
Rough Leaved Agave (Agave asperrima)
Rough Prickly Poppy (Argemone platyceras)
Rough Shell Macadamia Nut (Macadamia tetraphylla)
Rough Zexmenia (Zexmenia hispida)
Round Leaf Prostanthera (Prostanthera rotundifolia)
Round Leaved Saxifrage (Saxifraga rotundifolia)
Round Leaved Snow Gum (Eucalyptus perriniana)
Round-Headed Garlic (Allium sphaerocephalon)
Roundleaf Fern (Pellaea rotundifolia)
Roundleaf Serviceberry (Amelanchier sanguinea var. grandiflora)
Round-leaf Vitex (Vitex rotundifolia)
Round-leafed Mallee (Eucalyptus orbifolia)
Round-leafed Moort (Eucalyptus platypus)
Round-Leafed Navel-Wort (Cotyledon orbiculata)
Roundlobe Hepatica (Hepatica nobilis var. obtusa)
Rover Bellflower (Campanula rapunculoides)
Roving Prickly Pear (Opuntia repens)
Roving Sailor (Maurandella antirrhiniflora)
Rowan (Sorbus aucuparia)
Roxburgh Fig (Ficus auriculata)
Royal Beard Tongue (Penstemon spectabilis)
Royal Fern (Osmunda regalis)
Royal Hakea (Hakea victoriae)
Royal Paint Brush (Haemanthus albiflos)
Royal Paulownia (Paulownia tomentosa)
Royal Poinciana (Delonix regia)
Royen's Tree Cactus (Pilosocereus royenii)
Rubber Plant (Ficus elastica)
Rubber Rabbitbrush (Ericameria Χ × bolanderi)
Rubber Rabbitbrush (Ericameria nauseosa)
Ruby Ball (Gymnocalycium mihanovichii cv. 'Hibotan')
Ruby Salt Bush (Enchylaena tomentosa)
Ruby Sheepbush (Enchylaena tomentosa)
Rue (Ruta graveolens)
Rue Anemone (Thalictrum thalictroides)
Ruellia (Ruellia simplex)
Rugosa Rose (Rosa rugosa)
Running Rockcress (Arabis procurrens)
Runyon's Waterwillow (Justicia runyonii)
Rush Lily (Sisyrinchium striatum)
Russel Lupine (Lupinus Russel's Hybrids)
Russet Buffaloberry (Shepherdia canadensis)
Russian Hawthorn (Crataegus ambigua)
Russian Iris (Iris ensata)
Russian Olive (Elaeagnus angustifolia)
Russian Pea Shrub (Caragana frutex)
Russian Sage (Perovskia atriplicifolia)
Rusty Foxglove (Digitalis ferruginea)
Rusty-Leaf Fig (Ficus rubiginosa)

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