1Research Institute of forest and Langland of Iran
2Research institute of forests and rangland of Iran
3Shahid Beheshti University
Section Gamosepalum has been reported from Turkey for the first time by Dudley. In recent years, several species of this section were reported as new records for Iran. Four species of Alyssum section are tranfered from sect. Alyssum to sect. Gamosepalum with considering of important characters in each section. These changes made two synonymies. Five species of Gamosepalum section including A. lanceolatum, A. persicum, A. lepidoto-stellatum, A. mulleri and A. baumgartnerianum are present in Iran. Identification key of accepted species and distribution map of them are given. All specimens examined in the present work are deposited at FUMH, G, TARI and W.