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The epoxy fatty acid components isolated from the seed oil ofV. anthelmintica, Indian ironweed, where the seed had been allowed to undergo lipolysis after grinding, were trivernolin, 1,3‐divernolin, and vernolic acid. By inactivation of the hydrolytic enzyme system present in the seed, oil containing more than 50% trivernolin may be obtained. This species has potentialities as a replacement crop for those now in surplus; its seed contains 20 to 26% of an oil rich in epoxyoleic (vernolic) acid combined as glycerides amounting to 70 to 75%.

Seed oils ofEuphorbia lagascae Spreng. andVernonia anthelmintica (L.) Willd. were prepared, refined and epoxidized; trivernolin was prepared fromV. anthelmintica and also epoxidized. These products were each comparatively evaluated as plasticizer‐stabilizers for polyvinyl chloride against commercial controls. EpoxidizedEuphorbia andVernonia oils and epoxidized trivernolin have potential value as primary plasticizers with the added advantage of increased heat and light stability; they could also be used in combination with other plasticizers utilizing the latter properties. Crude and refinedEuphorbia andVernonia oils are not considered suitable primary plasticizers because of poor compatibility and permanence; at low levels they probably could be used as stabilizers.