. Biochemical systematics. Biochemical variation; Botany. H3C Q. H,C III Both helenalin (I) and arborescin (II) are sesquiterpenes of the guajol type. They differ in their mode of lactone formation. To the writer's knowledge Type I is not found in Anthemideae. However, both II and III are found in the Anthemideae (in Artemisia species) but not the Helenieae (although tenuHn may be interpreted as a lactone of type I to which a two-carbon unit adds to form an acetal). Three eudesmol type sesquiterpene lactones related to a-santonin (alantolactone, isoalanto-lactone, and dihydroisoalantolactone)
. Biochemical systematics. Biochemical variation; Botany. H3C Q. H,C III Both helenalin (I) and arborescin (II) are sesquiterpenes of the guajol type. They differ in their mode of lactone formation. To the writer's knowledge Type I is not found in Anthemideae. However, both II and III are found in the Anthemideae (in Artemisia species) but not the Helenieae (although tenuHn may be interpreted as a lactone of type I to which a two-carbon unit adds to form an acetal). Three eudesmol type sesquiterpene lactones related to a-santonin (alantolactone, isoalanto-lactone, and dihydroisoalantolactone) occur in Inula helenium. Eudesmol, a non-lactone, is obtained from Balsa- morhiza, and ivahn, a lactone of the eudesmol type, is found in 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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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbotany
