New material on a rare species Silaum saxatilis (Umbelliferae) from southern limit of the Dzungarian Alatau (South-Eastern Kazakhstan) allowed to describe the structure of its fruits. The species is assigned to a distinct monotypic genus Tschulaktavia, the generic name was proposed by M. S. Bajtenov and validated here. Another speciens described by Bajtenov, Stenotaenia iliensis, is synonymized with Hyalolaena tshuiliensis. The genus Stenotaenia does not occus in Kazakhstan and the Middle Asia. 658