Allamanda angustifolia 
Allamanda blanchetii 
Allamanda cathartica 
Alpine gentian 
Arachnothryx leucophylla 
Ashanti blood 
Asperula libanotica 
Asperula setosa 
Autumn Gentian 
Azure Bluet 
Balloonplant 
Be-still Tree 
Bladder Gentian 
Blue field-madder 
Blue periwinkle 
Bottle gentian 
Bulgarian gentian 
Butterfly Weed 
Buttonbush 
Callipeltis aperta 
Callipeltis factorovskyi 
Calotrope 
Calotropis gigantea 
Candy Corn Vine