Abstract
Investigation of the sesquiterpene lactone chemistry of three Heliomeris species resulted in the purification of 15 known and four new compounds. H. longifolia var. annua (M. E. Jones) Yates and H. multiflora var. multiflora Yates contained germacrolides in combination with heliangolides of the furano- and 1,10-epoxy-type, a very common feature of subtribe Helianthinae. In contrast H. obscura (Blake) Ckll. showed a distinctive pattern of four heliangolides that could not be detected in the two other species.
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