Flora of Çaltepe and Çeletepe (Bolu)

This study was carried out to reveal the vascular plant diversity of Çaltepe and Çeletepe. During 2015−2018, 2340 plant specimens were collected from the research area and 363 genera and 767 taxa belonging to 81 families were determined. Of all the collected taxa, 66 are endemic and endemism rate is %8.60. The IUCN threat categories of endemic and rare plants at global level are as follows: 1 taxon in “CR” category, as well as 4 taxa “EN”, 4 taxa “VU”, 9 taxa “NT”, and 45 taxa “LC”. Also, 3 rare taxa are found in the “VU” category, as well as 1 rare taxon in the “DD” category at regional level. 56 taxa are new records for the province of Bolu. The largest families in the study area are as follows: Asteraceae 97 taxa (%12.65), Fabaceae 62 taxa (%8.08), Lamiaceae 51 taxa (%6.65), Rosaceae 44 taxa (%5.74), Poaceae 37 taxa (%4.82), Brassicaceae 35 taxa (%4.56), Caryophyllaceae 32 taxa (%4.17), Apiaceae 28 taxa (%3.65), Boraginaceae 27 taxa (%3.52) and Orchidaceae 24 taxa (%3.13). The distribution of taxa into phytogeographic regions are as follows: 234 taxa (%30.50) Euro-Siberian, 64 taxa (%8.34) Mediterranean, 46 taxa (%5.99) Irano-Turanian, and 423 taxa (%55.15) multiregional and/or unknown. Geranium and Silene (12 taxa) are the most common genera in the research area. These genera are followed by Salvia (11 taxa), Trifolium, Veronica and Campanula (each with 10 taxa), Ranunculus, Euphorbia and Vicia (each with 8 taxa), and Poa (7 taxa).