Özet:

This study was carried out to contribute to the flora of Çelikhan District (Adıyaman). 592 plant samples were collected from the research area. As a result of the evaluation of these plants, a total of 454 taxa were identified, including 295 genera belonging to 62 families. Of these taxa, 3 of them were belong to Pteridophyta and 451 of Spermatophyta divisions. Coniferophyta and Magnoliophyta subdivisions in the Spermatophyta division contained 2 and 449 taxa, respectively. It was determined that 449 taxa were belong to Magnoliophyta subdivision, 385 were belong to Magnoliopsida and 64 were belong to Liliopsida class. It was determined that 30 taxa from the study area were endemic, and the endemism rate was found to be 6.6%. The distribution of taxa according to phytogeographic regions were as follows: Anatolian-Turan 158 (34.8%), Mediterranean 34 (7.5%), Euro-Siberian 33 (7.1%), multi-regional and unknown phytogeographical regions 229 (50.4%). The first five family according to the number of taxa were; Asteraceae 42 (9.2%), Fabaceae 37 (8.1%), Brassicaceae 36 (7.9%), Lamiaceae 35 (7.7%), Poaceae 31 (6.8%). The first five genera according to the number of taxa were; Astragalus 9, Silene 8, Salvia 7, Trifolium 6 and Vicia 6. Within the scope of the study, a new and endemic onion species was discovered, named Adıyaman and this species was introduced to the literature as Allium adiyamanense Yıld. & Kılıç.

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