Seeds from 37 species of plants in the family Crueiferae were analyzed for oil and protein, and the fatty acid composition of the oils was determined by gas-liquid chromatography. Erueic acid, generally considered characteristic of erueifer oils, occurs in about three-fourths of these species in amounts ranging from 3 to 59%. Some oils free of erueic ~cid contain up to 63% linolenie acid or up to 58% eicosenoic.