The fatty acid compositions of the seed oils of Paullina meliaefolia, Urvillea uniloba and Cardiospermum grandiforum have been analysed as their methyl esters and 4,4-dimethyloxazoline derivatives by GC and GC-mass spectrometry. cis-13-Eicosenoic Acid (paullinic acid) and cis-11-octadecenoic acid (cis-vaccenic acid) were found to be the main components besides other monoenoic acid positional isomers. The stereochemistry of the double bonds was confirmed by IR and C-13 NMR spectroscopy. Moreover, the unusual fatty acids C16:2(c9, c12) and C20:2 (c11, c14) have been detected as minor compounds. The cyanolipids were identified as 1-cyano-2-hydroxymethylprop-2-ene-1-ol and 1-cyano-2-hydroxymethylprop-1-ene-3-ol derivatives by spectroscopic methods.