The genus Helianthemum Mill. includes 12 annual or perennial species in the Flora of Turkey, four of which are endemic. In this study, morphological, micromorphological, anatomical and palynological characteristics of the rare endemic H. germanicopolitanum Bornm. and H. antitauricum P.H. Davis & Coode are studied for the first time. H. germanicopolitanum is grown on chalky and limestone slopes in C, ankiri province. H. antitauricum is grown on rocky limestone slopes in Adana and Kayseri provinces. In morphological studies, detailed descriptions of these species and characteristic features are given. Besides, pollen and seed morphology are studied by SEM. The pollen grains of both species are tricolporate, medium sized and prolate-spheroidal. Exine ornamentation is identified as perforate under LM and striate-perforate under SEM. The seed characteristics clearly appear to have taxonomic significance. The seed coat of H. germanicopolitanum characterized by the rugulate-verrucate ornamentation clearly differs from that of H. antitauricum by striate. Finally, anatomical research characters are studied on H. germanicopolitanum and H. antitauricum samples.