<prompt> Cardiac glycosides are obtained from following plant source:Rauwolfia serpentina.Strophanthus gratus.Ricinus communis.Atropa belladonna.  <response>: The following are obtained from Rauwolfia serpentina--Reserpine. Strophanthus gratus--Strophanthin-G Ouabain A cardiac glycoside. Ricinus communis--Castor oil. Atropa belladonna--Atropine 