Genus Aurinia Desv. belongs to the Alysseae tribe within the Brassicaceae family. Species of the genus Aurinia are distributed mainly on the Balkan and Apennine peninsulas. Due to the overlap of morphological characteristics of fruits and seeds of five species (A. corymbosa, A. leucadea, A. petraea, A. saxatilis, A. sinuata) and one subspecies (A. petraea subsp. microcarpa), it is difficult to determine each one with certainty. The aim of the thesis was to describe the morphological variability of fruits and seeds, to determine whether there are clear morphological differences in the structures and to make a determination key. The research was conducted on 372 herbarium lists stored in the ZA, ZAHO, ZAGR, BEO, BEOU and BUNS collections. 11 morphological features were observed. The number of seeds in one loculus, siliculae length, siliculae width, siliculae length to width ratio, pedicels length, seed length and width proved to be the most significant for distinguishing species. To distinguish the subspecies A. petraea subsp. microcarpa from A. corymbosa and A. petraea, fruit length, pedicels length, seed length and width proved to be the most significant so the fruit and seed of A. petraea subsp. microcarpa more closely resembles A. corymbosa. Based on the morphological analysis, a new determination key was proposed. Therein most morphometric characters have a narrower range than those previously reported in the literature.