Boenninghausenia
Bolax
Bolbitis
Bollea
Boltonia
Bolusanthus
Bomarea
Bombax
Bongardia
Borago
Borassus
Boronia
Bothriochloa
Bougainvillea
Bouteloua
Bouvardia
Bowenia
Bowiea
Brachychiton
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Brachyglottis
Brachyscome
Brachysema
Brachystelma
Bracteantha
Brahea
Brassavola
Brassia
Brassica
Brassocattleya
Brassolaeliocattleya
Breynia
Briggsia
Brimeura
Briza
Brodiaea
Bromelia
Broughtonia
Broussonetia
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Browallia
Brownea
Browningia
Bruckenthalia
Brugmansia
Brunfelsia
Brunnera
Brunsvigia
Buddleja
Buglossoides
Bulbine
Bulbinella
Bulbocodium
Bulbophyllum
Buphthalmum
Bupleurum
Burchardia
Burchellia
Bursera
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Butea
Butia
Butomus
Buxus
Cabomba
Caesalpina
Caladium
Calamagrostis
Calamintha
Calamus
Calandrinia
Calanthe
Calathea
Calceolaria
Calendula
Calibanus
Calla
Calliandra
Callianthemum
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Callicarpa
Callirhoe
Callisia
Callistemon
Callistephus
Callitriche
Calluna
Calocedrus
Calochortus
Calomeria
Caloscordum
Calothamnus
Calpurnia
Caltha
Calycanthus
Calymmanthium
Calypso
Calytrix
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