The alkaloid content of ten Identified and three unidentified species of Haemanthus has been investigated. Five new alkaloids named coccinine, manthidine, manthine, montanine and natalensine have been isolated and characterized. Tazettine was the major alkaloid found in H. albiflos and lycorine was isolated in trace amount from H. coccineus. © 1955, American Chemical Society. All rights reserved.