Cynanchum viminale 
Desmidorchis retrospiciens 
Eastern Bluestar 
Elephant's Foot Plant 
European Caralluma 
Fewflower milkweed 
Fourleaf milkweed 
Fringed twinevine 
Ghost-Men 
Glossonema boveanum 
Golden Trumpet 
Gomphocarpus fruticosus 
Gomphocarpus physocarpus, 
Gomphocarpus sinaicus 
Greater Periwinkle 
Hallab 
Hammerleaf Frangipani 
Hemp Dogbane 
Herbaceous periwinkle 
Hoya curtisii 
Hoya ignorata 
Hoya lacunosa 
Hoya lasiantha 
Hoya multiflora