Özet:

In this study, phytogeographic regions and threat categories of endemic and rare plants growing in Tosya district are determined. Tosya placed in southeast of the Kastamonu province, it is located in the transition region between Irano-Turanian and Euro-Siberian phytogeographical regions. It is situated in A4-A5 squares according to the Davis' grid system. In the research area, 1058 plant specimens were collected from different vegetation periods between 2014-2016. After the identification, 816 taxa belonging to 409 genera and 97 families have been determined. 48 of these taxa are cultivated plants. The number of endemic taxa is 79 and endemism ratio is 10.29%. There are 2 rare taxa in the research area. Within the endemic flora, the largest families are Fabaceae (10 taxa), Boraginaceae (9 taxa) and Brassicaceae (8 taxa) in terms of the number of taxa included. The largest genera are Astragalus (8 taxa), Onosma (5 taxa) and Verbascum (4 taxa), by the highest number of endemic taxa. The distribution of phytogeographic elements of the endemic flora is Irano-Turanian 35 (44.30%), Euxine 9 (11.40%), Euro-Siberian 4 (5.06%), E. Mediterranean 4 (5.06%) and multiregional or unknown phytogeographic elements 27 (34.18%). IUCN threat categories of endemic taxa's as follows: 1 CR (Critically endangered), 4 EN (Endangered), 3 VU (Vulnerable), 3 LR (cd) (Conservation dependent), 10 LR (nt) (Near threatened), 52 LR (lc) (Least concern), 1 DD (Data deficient) and 5 NE (Not evaluated). Both rare taxa are in the VU category.

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