Lupinus barbiger S. Wats, from Arizona and Utah contains three alkaloids, sparteine, dilupine and trilupine, the last two of which were previously undescribed. Dilupine, provisionally C16H26O2N2, appears to be the amine oxide of a C-methyl-lupanine. Trilupine, C15H24O3N2, is the di-amine oxide of d-lupanine into which it may be converted by the action of acids and heat. It may be prepared by oxidizing d-lupanine with calcium dioxide. © 1936, American Chemical Society. All rights reserved.