. Biochemical systematics. Biochemical variation; Botany. TERPENOIDS 265 Table 13-5. Distribution of sesquiterpene lactones according to sections of the genus Helenium and related genera. Tribe Helenieae (As Classically Constituted) Helenium Sect. Helenium (One species examined) Sect. Tetrodus (Seven species examined) helenalin helenalin Sect. Leptopoda (Four species examined) mexicanin brevilin tenulin flexuostn helenalin pinnatifidin Tribe Heliantheae (As Classically Constituted) A ctinospermum helenalin Balduina balduilui Two types of lactones derived from sesquiterpenes are to be found amo
. Biochemical systematics. Biochemical variation; Botany. TERPENOIDS 265 Table 13-5. Distribution of sesquiterpene lactones according to sections of the genus Helenium and related genera. Tribe Helenieae (As Classically Constituted) Helenium Sect. Helenium (One species examined) Sect. Tetrodus (Seven species examined) helenalin helenalin Sect. Leptopoda (Four species examined) mexicanin brevilin tenulin flexuostn helenalin pinnatifidin Tribe Heliantheae (As Classically Constituted) A ctinospermum helenalin Balduina balduilui Two types of lactones derived from sesquiterpenes are to be found among Artemisia species. Neither type is identical with the sesquiterpene lactones of Helenium, but both types are closely related on structural grounds. The helenalin type (I) is illustrated again for purposes of comparison with arborescin (II) and a-santonin (III).. CH. 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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