. Biochemical systematics. Biochemical variation; Botany. TERPENOIDS 257. =0 cardenolid Some other compounds in this class are digitoxigenin, uzari- genin, xysmalogenin, canarygenin, adynerigenin, and their glycosides. Korte and Korte (1955b) have studied the distribution of these com- pounds, certain related alkaloids, and lower terpenes in the order Contortae with some exceedingly interesting results. Within the order the family Gentianaceae is consistent in having the terpene, gentio- pikrin, present in all forms examined. OH O + glucose gentiopikrin The family Menyanthaceae (sometimes clas

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. Biochemical systematics. Biochemical variation; Botany. TERPENOIDS 257. =0 cardenolid Some other compounds in this class are digitoxigenin, uzari- genin, xysmalogenin, canarygenin, adynerigenin, and their glycosides. Korte and Korte (1955b) have studied the distribution of these com- pounds, certain related alkaloids, and lower terpenes in the order Contortae with some exceedingly interesting results. Within the order the family Gentianaceae is consistent in having the terpene, gentio- pikrin, present in all forms examined. OH O + glucose gentiopikrin The family Menyanthaceae (sometimes classified as a sub- family of the Gentianaceae) are separated from the Gentianaceae by the presence of the bitter principle loganin (= meliatin) in the former and the absence of gentiopicrin in those members of the Menyan- thaceae examined. O HOH2C c .CH-CH C=CHCH3 H3COOC H2C CHOH loganin Both families include some species which produce the alkaloid, gentianin [note that Karrer (1958) lists gentianin both as an anthocyanin and as a xanthone, neither compound containing nitro- gen] the structure of which is given below: CH=CH2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Alston, Ralph E; Turner, B. L. (Billie Lee), 1925-. Englewood Cliffs, N. J. , Prentice-Hall