The alkaloid "hieracifoline," isolated by Manske from Erechtites hieracifolia, is a mixture. By employing a partition chromatographic procedure, the two compounds, namely, senecionine and seneciphylline, were separated. From the alkaloid "jacobine," isolated by Manske from Senecio jacobea, senecionine, seneciphylline and a third alkaloid which is identical with Bradbury's and Culvenor's jacobine, were obtained. These same three components in different ratios were present in a sample of Senecio jacobea L. of Norwegian origin.