From Crotalaria juncea seed by ethanolic extraction, riddelline, seneciphylline and senecionine have been isolated and identified. By subsequent methanolic extraction, a new alkaloid designated as junceine was obtained together with trichodesmine, previously reported as the alkaloid in Trichodesma incanum. An optically inactive amino acid also was present which was identified as /3-hydroxy-N-methyl-DL-norvaline A. © 1956, American Chemical Society. All rights reserved.