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    The Flora of the Yuvacık Watershed (Kocaeli-Sakarya)
    (Düzce Üniversitesi, 2013) Efe, Asuman; Aksoy, Necmi; Güneş Özkan, Neval; Demir Oral, Dilek; Aslan, Serdar
    Yuvacık Dam Watershed (Kocaeli-Sakarya) is situated in between the provincial borders of Kocaeli and Sakarya at the north eastern part of the Marmara Region. According to Turkey’s grid square system, the study area is located in A2(A) and A3 squares. The total study area is 25759 ha with elevation varying between 150 and 1610 metres. The study area is in the transition zones of the three different phytogeographic regions including the Euro-Siberian (Sub-Euxine, under side section), the Mediterranean (the Aegean, under side section), and Irano-Turanian (the side of the inner Anatolia). In the years from 2005 to 2008, total 14 research trips were made to the area, from March - which is the beginning of the vegetation period - to September, which is the end of thevegetation period. In these trips, more than 2000 plant specimens were collected. After the identification of the specimens, 485 taxa were determined as 282 genera belonging to 82 families. 26 taxa were endemic and the rate of endemism was % 5.36. The phytogeographic elements of the area are as follows: Irano-Turanian elements 14 (% 2,9), EuroSiberian elements 137 (33 taxa is Euxine elements) (% 28,3), Mediterranean elements 66 (% 13,6) and the others wide spreaded and those of which phytogeographical region are unidentified, 268 (% 55,3). One of the most valuable result of the study is determination of a new genus for the the flora of Turkey: Chamaespartium sagittale (L.) P.E.Gibbs (Fabaceae).