A Phytochemical Investigation Of The Overground Parts Of Sencio Glabellus Resulted In Isolation and Identification Of Five Pyrrolizidine Alkaloids: Florosenine (Acetylotosenine), Senecionine, Integerrimine, Otosenine and Senkirkine, By Comparison With Authentic Samples. Separation Of The First Three Of These Alkaloids From Otosenine and Senkirkine Was Realized By A Simple Liquid/Liquid Extraction Procedure Which Is Reported. This Is The First Report Of The Occurrence Of Florosenine, Otosenine and Senkirkine In S. Glabellus. © 1990 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.