| Boenninghausenia |
Boenninghausenia albiflora |
 |
| Bog Asphodel |
Narthecium ossifragum |
 |
| Bog Myrtle |
Myrica gale |
|
| Borage |
Borago officinalis |
|
| Border Pink |
Dianthus plumarius |
|
| Botta's Fairyfan |
Clarkia bottae |
 |
| Bottle Brush |
Callistemon |
|
| Bottletree |
Brachychiton bidwillii |
|
| Bower Plant, Bower Vine |
Pandorea jasminoides |
 |
| Brazilian Fire Tree |
Schizolobium parahybum |
|
| Brazilian Ironwood |
Caesalpinia ferrea |
|
| Brazilian Red Cloak |
Megaskapasma erythrochlamys |
 |
| Bridal Wreath |
Francoa |
|
| Bridal Wreath |
Stephanotis floribunda |
|
| Bristly Locust |
Robinia hispida v fertilis |
|
| Broom |
Cytisus x praecox |
|
| Broom Cupflower |
Nierembergia scoparia |
|
| Brush Bush |
Eucryphia glutinosa |
|
| Buckwheat |
Eriogonum jamesii |
|
| Bugle |
Ajuga reptans |
|
| Bulbous Corydalis |
Corydalis cava |
|
| Bull Bay |
Magnolia grandiflora |
|
| Burnet Saxifrage |
Pimpinella saxifraga |
 |
| Burning Bush |
Bassia (Kochia) scoparia |
|
| Burning Bush |
Dictamnus albus |
|
| Burridge's Greenthread |
Cosmidium burridgeanum |
|
| Bush Allamanda |
Allamanda schottii |
|
| Bush Clock Vine |
Thunbergia erecta |
|
| Bush Vetch |
Vicia sepium |
|
| Bush Violet |
Browallia speciosa |
|
| Busy Lizzie (many) |
Impatiens |
|
| Busy Lizzie |
Impatiens x walleriana hybrid |
|
| Butterfly Bush |
Buddleja (Buddleia) x davidii |
|
| Butterfly Flower |
Schizanthus hookeri |
|
| Butterfly Pea |
Clitoria ternatea |
|
| Butterfly Weed |
Asclepias incarnata |
|
| Butterwort (many) |
Pinguicula |
|
| Butterwort |
Pinguicula |
|
