Search for new industrial oils. X. Seed oils of the calenduleae

Abstract Seed oils from 29 species in five genera of the tribe Calenduleae, family Compositae, have been examined to determine the distribution of dimorphecolic acid (9‐hydroxyl‐ trans ‐10, trans ‐12‐octadecadienoic acid) among the close relatives of Dimorphotheca . Dimorphecolic acid occurs in all five of the Dimorphotheca species of Osteospermum in amounts ranging from 34舑75% of the oil. In all other species of the tribe analyzed to date, including 14 species of Osteospermum , two of Calendula , and two of Chrysanthemoides , the oil contained conjugated trienoic acids ranging from 14舑60%.

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