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A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z Raddia brasiliensis
Rafinesquia neomexicana (New Mexico Plumseed, Desert Chicory)
Ranunculus( 5 taxa)
Raoulia australis
Raphiolepis
Raphionacme flanaganii
Rapicactus
Rathbunia
Ratibida( 2 taxa)
Rauhocereus( 2 taxa)
Rauvolfia samarensis
Ravenea( 2 taxa)
Rebulobivia
Rebutia( 68 taxa)
Rectanthera
Rehmannia elata (Chinese Foxglove)
Rehsonia
Reicheocactus
Reinwardtia indica (Yellow Flax)
Renealmia
Reseda odorata (Garden Mignonette)
Reynoutria
Rhacodiscus
Rhamnus( 5 taxa)
Rhaphiolepis( 4 taxa)
Rhapis( 2 taxa)
Rhexia
Rhinephyllum( 2 taxa)
Rhipsalidopsis
Rhipsalis( 47 taxa)
Rhodanthemum
Rhodocactus
Rhododendron( 3 taxa)
Rhodohypoxis baurii
Rhodophiala
Rhoeo spathacea (Moses-In-The-Boat, Oyster Plant)
Rhoicissus capensis (Evergreen Grape)
Rhombophyllum rhomboideum
Rhopalostylis( 2 taxa)
Rhus( 10 taxa)
Ribes( 9 taxa)
Ricinus communis (Castor Bean)
Riddellia
Rimacactus
Rimaria
Ritterocactus
Ritterocereus
Robinia( 3 taxa)
Rochea
Rodentiophila
Rodgersia( 5 taxa)
Romneya coulteri (Coulter's Matilija Poppy)
Rondeletia odorata
Roodia
Rooksbya
Rosa( 32 taxa)
Rose
Roseocactus
Roseocereus
Rosmarinus( 2 taxa)
Roulinia
Roupellia
Rubus( 3 taxa)
Rudbeckia( 5 taxa)
Ruelingia
Ruellia( 9 taxa)
Rumohra adiantiformis (Leatherleaf Fern, Iron Fern)
Runyonia
Ruschia( 12 taxa)
Ruschianthus falcatus
Ruscus( 2 taxa)
Russelia( 2 taxa)
Russellodendron
Ruta graveolens (Rue, Herb of Grace)
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