In this group are classed Digitalis purpurea, Strophanthus Kombe, and S. hispidus, Convallaria majalis, Urginea Scilla, Helleborus niger, Apocynum cannabinum, Adonis vernalis, Nerium oleander, Erythro-phlceum Guinense, and a few others.

It is noteworthy that the active principles in these drugs are glycosides, and while their chemical composition may vary considerably, their pharmacological actions are very similar.