genus Scorzonera
genus Scrophularia
genus Scutellaria
genus Scutigera
genus Scutigerella
genus Sebastiana
genus Sebastodes
genus Secale
genus Sedum
genus Seismosaurus
genus Seiurus
genus Selaginella
genus Selar
genus Selenarctos
genus Selene
genus Selenicereus
genus Selenipedium
genus Senecio
genus Senna
genus Sepia
genus Septobasidium
genus Sequoia
genus Sequoiadendron
genus Serenoa
genus Sericocarpus
genus Serinus
genus Seriola
genus Seriphidium
genus Seriphus
genus Serranus
genus Serrasalmus
genus Serratia
genus Serratula
genus Sertularia
genus Sesamum
genus Sesbania
genus Seseli
genus Setaria
genus Setophaga
genus Shigella
genus Shorea
genus Shortia
genus Sialia
genus Sialis
genus Sida
genus Sidalcea
genus Sideritis
genus Sigmodon
genus Silene
genus Sillago
genus Silphium
genus Silurus
genus Silvia
genus Silybum
genus Simarouba
genus Simulium
genus Sinanthropus
genus Sinapis
genus Sinningia
genus Sinornis
genus Siren
genus Sison
genus Sistrurus
genus Sisymbrium
genus Sisyrinchium
genus Sitophylus
genus Sitotroga
genus Sitta
genus Sium
genus Sivapithecus
genus Sloanea
genus Smilax
genus Smiledon
genus Smyrnium
genus Sobralia
genus Solandra
genus Solanopteris
genus Solanum
genus Solea
genus Soleirolia
genus Solenopsis
genus Solenostemon
genus Solidago
genus Somateria
genus Sonchus
genus Sonora
genus Sophora
genus Sorbus
genus Sorex
genus Sorghum
genus Spadella
genus Spalax
genus Sparaxis
genus Sparganium
genus Sparmannia
genus Spartina
genus Spartium
genus Spathiphyllum
genus Spergula
genus Spergularia
genus Spermophilus