Baccharis
Bacopa
Baileya
Balbisia
Ballota
Banksia
Baptisia
Barlia
Bartsia
Beesia
Begonia
Belamcanda
Bellardia
Bellevalia
Berberis
Berchemia
Bergenia
Berkheya
Berlandiera
Berneuxia
Beschorneria
Bessera
Betonica
Betula
Biarum
Bidens
Biebersteinia
Bischofia
Biscutella
Bistorta
Blechnum
Blephilia
Bletilla
Blumenbachia
Boehmeria
Boltonia
Bomarea
Bongardia
Boopis
Boronia
Boschniakia
Bouteloua
Bowkeria
Boykinia
Brachanthemum
Brachycome
Braya
Brimeura
Brodiaea
Broussonetia
Browallia
Browningia
Brunnera
Brunsvigia
Bryonia
Buddleja
Bukiniczia
Bulbine
Bulbocodium
Buphtalmum
Bupleurum
Butomus