| Plant subtribes (Bo - Br) | 
|  | 
| Hawai'i dogweed |  | Rubiales > Rubiineae > Rubiaceae |  | 
|  | 
| bocconia, parrotweed |  | Papaverales > Papaveraceae > Bocconieae |  | 
|  | 
| Chinese grass, false nettle |  | Urticaceae > Boehmerioideae > Boehmerieae |  | 
|  | 
| alena, anena, climbing wartclub, spiderling, wineflower |  | Caryophyllales > Nyctaginaceae > Boerhavieae |  | 
|  | 
|  |  | Myrtales > Onagrineae > Onagraceae |  | 
|  | 
|  |  | Asteranae > Asterales > Asteraceae |  | 
|  | 
|  |  | Caryophyllanae > Caryophyllales > Nyctaginaceae |  | 
|  | 
| borage, cool-tankard, talewort |  | Boraginaceae > Boraginoideae > Boragineae |  | 
|  | 
| palm |  | Arecaceae > Borassoideae > Borasseae |  | 
|  | 
| boronia |  | Rutaceae > Boronioideae > Boronieae |  | 
|  | 
|  |  | Caryophyllanae > Caryophyllales > Amaranthaceae |  | 
|  | 
|  |  | Fabanae > Fabales > Fabaceae |  | 
|  | 
| bougainvillea, paperflower |  | Caryophyllales > Nyctaginaceae > Bougainvilleeae |  | 
|  | 
|  |  | Aralianae > Araliales > Hydrocotylaceae |  | 
|  | 
| bowlesia |  | Aralianae > Araliales > Hydrocotylaceae |  | 
|  | 
| false brome |  | Juncanae > Poales > Poaceae |  | 
|  | 
| broccoli, broccoli raab, brussels sprouts, cabbage, collards, colza, kale, kohlrabi, mustard, napa, pak choi, rape, sarson, seventop turnip, tender green, toria |  | Cruciferae > Brassicoideae > Brassiceae |  | 
|  | 
| brome, bromegrass, cheat, cheat grass, chess, rescuegrass, rigput |  | Poales > Poaceae > Bromeae |  | 
|  | 
| greentwig |  | Fabanae > Fabales > Fabaceae |  | 
|  | 
| brosimum, cow tree, ramon |  | Urticales > Moraceae > Brosimeae |  | 
|  | 
|  |  | Moraceae > Broussonetioideae > Broussontieae |  | 
|  | 
|  |  | Tiliineae > Tiliaceae > Brownlowieae |  | 
|  | 
| West Indian sumac, brunellia |  | Saxifraganae > Cunoniales > Brunelliaceae |  | 
|  | 
| buckwheat vine |  | Polygonaceae > Brunnichioideae > Brunnichieae |  | 
|  | 
|  |  | Lilianae > Amaryllidales > Amaryllidaceae |  |