Fifteen plants were considered as raw materials for prodn. of biodiesel fuels. Their seeds were studied for dry mass, fats, ash, fibers and proteins and pressed or extd. with Me2CO to recover the oil components. The oils were transesterified with MeOH to prep. resp. fatty acid Me esters examd. then for chem. compn., d., viscosity, acid, sapon. and iodine values, as well as for low- and high-temp. properties. The fuels prepd. from white mustard oil (Sinapis alba L.), hempseed oil (Cannabis sativa L.) and poppy oil (Papaver somniferum L.) seeds were recognized as the most promising, as they fulfilled the requirements of biodiesel stds. (low content of polyunsatd. fatty acid esters, concn. of linolenic acid below 12% by mass, viscosity between 3.5-5.0 mm(2)/s at 40 degrees C, d. between 860-900 kg/m(3) at 15 degrees C, acid value below 0.5, iodine value below 120, flash point above 101 degrees C and cloud points between -5 degrees C and 5 degrees C).