| BACKEBERGIA Bravo | |
| BARTSCHELLA Br&R | 
MAMMILLARIA Haw
|
| BERGEROCACTUS Br&R | |
| BINGHAMIA Backeberg |
HAAGEOCEREUS Backeberg
|
| BINGHAMIA Br&R non Agardh |
ESPOSTOA Br&R
emend. Werd
|
| BISNAGA Orcutt |
FEROCACTUS Br&R
|
| BLOSSFELDIA Werdermann | |
| BOLIVICEREUS Cardenas |
CLEISTOCACTUS Lemaire
|
| BONIFAZIA Stand. & Steyermark |
DISOCACTUS Lindl
|
| BORZICACTELLA Ritter |
CLEISTOCACTUS Lemaire
|
| BORZICACTUS Ricc |
CLEISTOCACTUS Lemaire
|
| BORZIPOSTOA | |
| BRACHYCALYCIUM Backeberg |
GYMNOCALYCIUM Pfeiffer
|
| BRACHYCEREUS Br&R | |
| BRASILICACTUS Backeberg |
PARODIA
|
| BRASILICEREUS Backeberg | |
| BRASILIOPUNTIA (Sch) Berg |
OPUNTIA
|
| BRASILIPARODIA Ritter |
PARODIA
|
| BRITTONIA Houghton ex Armstr. | |
| BRITTONROSEA |
STENOCACTUS
|
| BROWNINGIA Br&R | |
| BUININGIA Buxbaum |
COLEOCEPHALOCEREUS Backeberg
|