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  • 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
  • genus sanguinaria
  • genus sanicula
  • genus sansevieria
  • genus santalum
  • genus santolina
  • genus sanvitalia
  • genus sapindus
  • genus saponaria
  • genus saprolegnia
  • genus sarcobatus
  • genus sarcocephalus
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