<jats:p> Pyrrolizidine alkaloids were isolated from Seneciotriangularis Hook, growing in Alberta, and identified as 7-angelylretronecine, 7-senecioylretronecine, 7-angelyl-9-sarracinylretronecine, and 7-senecioyl-9-sarracinylretronecine, the last three of which appear to be new natural products.