. Biochemical systematics. Biochemical variation; Botany. Jerveratrum group. Veratramine, rubijervine, isorubijervine, OH Ceveratrum group. Zygadenine, veracevine, germine, proto- verine. The two groups possess the C27 ring structure (other vera- trum alkaloid types are incompletely identified). The jerveratrum types, with few hydroxyl groups, occur as free bases or as simple glucosides. The ceveratrum types, with seven to nine hydroxyl sub- stitutions, usually occur esterified with various acids or ester alkaloids, never as glycosides. Among the ceveratrum types, zygadenine and verac
. Biochemical systematics. Biochemical variation; Botany. Jerveratrum group. Veratramine, rubijervine, isorubijervine, OH Ceveratrum group. Zygadenine, veracevine, germine, proto- verine. The two groups possess the C27 ring structure (other vera- trum alkaloid types are incompletely identified). The jerveratrum types, with few hydroxyl groups, occur as free bases or as simple glucosides. The ceveratrum types, with seven to nine hydroxyl sub- stitutions, usually occur esterified with various acids or ester alkaloids, never as glycosides. Among the ceveratrum types, zygadenine and veracevine occur as monoesters; germine and protoverine occur as tri or tetra esters. The genera concerned are Veratrum, Zygadenus, Stenanthium, Schoenocaulon, Amianthium, and Melanthium. Schoenocaulon is re- garded as rather distinctive and homogeneus, Veratrum as relatively homogeneous, Stenanthium as small and diverse, and Zygadenus as quite heterogeneous possibly including several genera (as subgenera). The distribution of veratrum alkaloids is given in Table 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 Alston, Ralph E; Turner, B. L. (Billie Lee), 1925-. Englewood Cliffs, N. J. , Prentice-Hall
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