With the aim of improving the floristic knowledge of Kosovo, here we present an inventory of the plant taxa recorded and collected between the March 2015 and September 2019, in the mountain massif of Luboten, Sharri Mts., SE Kosovo. Field surveys were conducted repeatedly for four years, on each vegetation season. With this work we aimed to provide detailed data concerning the vascular flora richness and distributional patterns. Floristic samples were studied in all representative habitats and sites, concerning climate, exposition, altitude and bedrock composition. This research led to the identification of a total 853 plant taxa of vascular plants, belonging to 354 genera and 93 families. Among these taxa, 82 are Balkan endemics and 53 are included into the Red Book of Vascular Flora of Kosovo. Out of them, 4 are critically endangered, 16 endangered, 3 vulnerable, 8 near threatened and 22 least concern. On the basis of the available floristic literature, 2 plant taxa are found to be new for Kosovo: Bromopsis cappadocica subsp. cappadocica and Pilosella macrotricha. At a national scale, we have found new distribution records for 17 taxa and additionally for 2 plant taxa: Ranunculus fontanus and Sesleria wettsteinii, conservation suggestions are provided. All natural habitats were classified according to EUNIS and their floristic richness is herein provided. Furthermore, the corresponding EUNIS habitat(s) for each taxon of where it was recorded to be growing are also indicated.