Description and diagnosis of weed species of some genus in Fabaceae of family concerning Trifolium species in wheat fields in İzmir and its environment the objective of this study is to determine and identify the species belonging to Fabaceae family which are frequently observed in İzmir and its environment. In this study, the species of genus named as Trifolium has been sampled and diagnosed. A total amount of seven species belonging to two genus have been identifed. The systematic properities of these species have been presented and the identification of these properities are supported by figures. As a result, the identification of species has become easer. The species which have been determined are as follows: Trifolium campestre Schreb. T. clypeatum L, T. hybridum L., T. repens L, T. resupinatum L., T. spumosum L. ve T. tomentosum L.