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▶ Rafinesquia
Common name: Plumeseed
▶ Ranunculus
Common name: Buttercup
▶ Raphanus
Common name: Radish
▶ Ratibida
Common name: Mexican hat
▶ Reseda
Common name: Mignonette
▶ Rhamnus
Common name: Buckthorn
▶ Rhaponticum
Common name: Hardheads
▶ Rheum
Common name: Rhubarb
▶ Rhexia
Common name: Meadow-beauty
▶ Rhinanthus
Common name: Yellow-rattle
▶ Rhus
Common name: Sumac
▶ Rhynchospora
Common name: Beak-sedge
▶ Ribes
Common names: Currant, gooseberry
▶ Richardia
Common name: Mexican-clover
▶ Ricinus
Common name: Castor-bean
▶ Robinia
Common name: Locust
▶ Romneya
Common name: Matilija poppy
▶ Rorippa
Common name: Yellowcress
▶ Rosa
Common name: Rose
▶ Rosmarinus
Common name: Rosemary
▶ Rubus
Common names: Blackberry, raspberry
▶ Rudbeckia
Common name: Coneflower
▶ Ruellia
Common name: Wild petunia
▶ Rumex
Common names: Dock, sorrel
▶ Ruta
Common name: Rue