Lupinus sericeus Pursh collected in Colorado contained when dried 3.68% of alkaloids consisting of spathulatine, previously described, and nonalupine, a new lupine alkaloid. A reinvestigation of the chemistry of spathulatine has confirmed the empirical formula previously assigned to this base. Nonalupine is not basic enough to form salts with strong acids. © 1940, American Chemical Society. All rights reserved.