genus Rachycentron genus Radiigera genus Radyera genus Raffia genus Raja genus Ramalina genus Ramphomicron genus Rana genus Ranatra genus Rangifer genus Ranunculus genus Raoulia genus raphanus genus Raphia genus Raphicerus genus Raphus genus Ratibida genus Rattus genus Rauvolfia genus Rauwolfia genus Ravenala genus Recurvirostra genus Regalecus genus Regnellidium genus Regulus genus Reithrodontomys genus Remilegia genus Reseda genus Retama genus Reticulitermes genus Retrophyllum genus Rhagoletis genus Rhamnus genus Rhapis genus Rhea genus Rheum genus Rhexia genus Rhincodon genus Rhinoceros genus Rhinonicteris
| genus Rhinoptera genus Rhipsalis genus Rhizobium genus Rhizoctinia genus Rhizophora genus Rhizopogon genus Rhizopus genus Rhodanthe genus Rhododendron genus Rhodosphaera genus Rhodymenia genus Rhus genus Rhyacotriton genus Rhynchoelaps genus Rhyncostylis genus Rhynia genus Ribes genus Richea genus Richmondena genus Ricinus genus Rickettsia genus Riparia genus Rissa genus Rivina genus Rivulus genus Robinia genus Roccella genus Roccus genus Rodolia genus Romneya genus Roridula genus Rorippa genus Rosa genus Rosellinia genus Rosmarinus genus Roystonea genus Rubia genus Rubus genus Rudbeckia genus Rumex
| genus Rumohra genus Rupicapra genus Rupicola genus Ruptiliocarpon genus Ruscus genus Russula genus Ruta genus Rutilus genus Rynchops genus Rypticus genus Sabal genus Sabbatia genus Sabinea genus Saccharomyces genus Saccharum genus Sadleria genus Sagina genus Sagitta genus Sagittaria genus Sagittarius genus Saiga genus Saimiri genus Saintpaulia genus Salamandra genus Salicornia genus Salix genus Salmo genus Salmonella genus Salpa genus Salpichroa genus Salpiglossis genus Salpinctes genus Salsola genus Salvadora genus Salvelinus genus Salvia genus Salvinia genus Sambucus genus Samia genus Samolus
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