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A major constituent of Lesquerella lasiocarpa seed oil is characterized as (+)-14-hydroxy-cz's-l 1-eicosenoic acid. For convenience, it is called lesquerolic acid.

Evidence is provided that sterculie and malvalie acids occur together in seed oils of Sterculia foetida, Hibisctls syriacus~ and Lavatera trimestris. Sterctdia foetida oil contains 54.5% sterculic and 6.7% malvalic acids; Hibiscus syriacus oil contains 16.3% nmlvalic and 3.4% stereulic; and Lavatera trimestris oil contains 7.7% malvMic and 0.6% sterculie acids. H~biscus syriacus oil also contains 1.5% dihydrosterculie acid. The cyelopropenoid acids were characterized by hydrogenation in conjunction with gas-liquid chromatography and by oxidation to ~-dioxo acids with subsequent cleavage with peracetie acid. Acetolysis of epoxides in the presence of cyclopropenes was effectcd by room ten> perature treatment with acetic acid-10% sulfuric acid (5:2).

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