The fatty acid compositions of the 37 plant seed oils were determined by Gas Chromotography. Fatty acid compositions of oils were determined as follows: stearic (0.08 (Allium sieheanum Hausskn. ex Kollmann Endemic)-9.78% (Termopsis turcica Kit Tan, Vural & Küçüködük- Endemic)), behenic (0.09% (Robinra pseudoacacia L.)-34.38% (Sisyrobrium altissimum L.)), linolenic (6.55% (Suaeda carnossissima Post)-41.18% (Prangus hyniae H. Duman & M.F. Watson Endemic)), cis-11,14-eicosadienoic (0.15% (Prangus hyniae H. Duman & M.F. Watson Endemic)-69.55% (Asphadelina rigidifolia (Boiss.) Baker- Endemic )), heneicosanoic (7.00% (Isatis tinctoria L. subsp. tomentella (Boiss.) P.H. Davis and Hyacin Hella campanulata K.M. Perss. & Wendelbo- Endemic)-59.93% (Allium cappadocicum Boiss. Endemic) and caproic (0.43% (Sisyrobrium altissimum L.) - 43.44% (Bupleunim rotundifolium L.)) and some minor fatty acids. The highest heneicosanoic acid was found in termopsis (51.93%), Pyrus elaeagnifolia Pall. subsp. elaeagnifolia (31.61%), Hibiscus syriacus L. (33.22%), Crateagus monogyna Jacq subsp. monogyna (43.33%), Camelina rumellca Vel. (43.33%), Colutea cilicita Boiss. & Bal., Cicer pinnatifidum, Cercus siliquastrum L. subsp. siliquastrum plant seed oils.