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  • genus pyxidanthera
  • genus quamassia
  • genus quassia
  • genus quercus
  • genus quiscalus
  • 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
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