Balatium berteroanum – synonym of Dicksonia berteroana
Bellota miersii – synonym of Beilschmiedia miersii
Bellota nitida – synonym of Beilschmiedia berteroana
Bellota pauciflora – synonym of Beilschmiedia berteroana
Betula antarctica – synonym of Nothofagus betuloides
Blepharocalyx divaricatus – synonym of Blepharocalyx cruckshanksii
Boaria molinae – synonym of Maytenus boaria
Boldea boldus – synonym of Peumus boldus
Boldoa fragrans – synonym of Peumus boldus
Boldu chilanum – synonym of Beilschmiedia berteroana
Boldu chilanum – synonym of Beilschmiedia miersii
Boldu nitidum – synonym of Beilschmiedia berteroana
Boldus chilensis – synonym of Peumus boldus
Buddleja connata – synonym of Buddleja globosa
Bystropogon erianthus – synonym of Cuminia eriantha