Barleria involucrata 
Barleria prionitis 
Barrett's beardtongue 
Bartsia alpina 
Basil thyme 
Basil-Thyme 
Bastard balm 
Beach Vitex 
Bean broomrape 
Bear's breeches 
Bedstraw Broomrape 
Beech drops 
Bells-of-Ireland 
Bengal Clockvine 
Bifid Bladderwort 
Bifid Hemp-Nettle 
Bird's-Beak Lousewort 
Bird's-eye speedwell 
Black ash 
Black-eyed Susan vine 
Bleeding glory-bower 
Blepharis attenuata 
Blepharis calcitrapa 
Blepharis ciliaris