The genus CampanulaL., naturally distributed in Northern hemisphere and Mediterranean Region and represented byalmost 420 species in the World, comprises 136 taxa including recently recordednew species in our country. More than half of the taxa are endemic to Turkey.In this investigation, two closely relative and endemic species (C. betulifolia C. Koch and C. choruhensis Kit Tan & Sorger)were examined anatomically and IUCN risk categories were reevaluated. Plantsamples were collected from Yusufeli district of Artvin province and Herbariummaterials were prepared. Morphological observations were performed in herbariumsamples, while anatomical examinations were made from fixated specimens in 70%alcohol. Transverse sections of stem and leaf, and paradermal sections of upperand lower epidermis of leaves were prepared manually. Thickness of midrib, lengthsand widths of vascular bundles, shape and thickness of leaf lamina werecompared between the species and important differences were observed in basalleaves from than cauline leaves of the species.From paradermal sections, amphistomatic type stomata’s lengths, indexesand number of stomata per mm2were compared among the species. The biggest stomatal lengths were detected inthe adaxial surfaces of basal leaves for C. choruhensis, while thesmallest ones were observed in the same leaf surfaces of C. betulifolia.According to stomatal numbers per 1 mm2 and stomatal indexes, C.choruhensis has the highest values. Epidermal leaf surfaces are straight inadaxial surfaces of both basal and cauline leaves, whereas undulate-sinuoussurfaces are present in abaxial surfaces. This study displays anatomicalcharacteristic of two closely related endemic species here, for the first time.