Browningia
Brugmansia
Brunfelsia
Brunnera
Brunsvigia
Buddleja
Buglossoides
Bulbine
Bulbinella
Bulbocodium
Bulbophyllum
Buphthalmum
Bupleurum
Burchardia
Burchellia
Bursera
Butea

Butia
Butomus
Buxus
Cabomba
Caesalpina
Caladium
Calamagrostis
Calamintha
Calandrinia
Calathea
Calceolaria
Calendula
Calibanus
Calliandra
Callianthemum
Callicarpa
Callirhoe

Callisia
Callistemon
Callistephus
Callitriche
Calluna
Calocedrus
Calochortus
Calothamnus
Calpurnia
Caltha
Calycanthus
Calytrix
Camassia
Camellia
Campanula
Campsis
Canarina

Canistrum
Canna
Cantua
Capsicum
Caragana
Caralluma
Cardamine
Cardiocrinum
Cardiospermum
Carex
Carissa
Carlina
Carludovica
Carmichaelia
Carnegiea
Carpentaria