Brillantaisia nitens 
Brillantaisia owariensis 
Broad-leaved Mountain Mint 
Broadleaf Glandweed 
Broadleaf Plantain 
Brownies 
Buck's-horn Plantain 
Buddleja madagascariensis 
Bush clock vine 
Butter-and-eggs 
Butterfly-bush 
Buttonsage 
Calabash Tree 
Calceolaria microbefaria 
Camphor Thyme 
Canada Toadflax 
Canadian Lousewort 
Canary Island Foxglove 
Cape honeysuckle 
Carolina wild petunia 
Cascade penstemon 
Castilleja fissifolia 
Castilleja irazuensis 
Cat's Whiskers