Contribution to the flora of the Chersky National Park (Magadan Region)

The findings of two vascular plant species new to the Magadan Region and the north of the Russian Far East (Arctostaphylos uva-ursi (L.) Spreng., Cypripedium calceolus L.), new localities of Triglochin maritima L., and a new locality of a rare liverwort species (Bucegia romanica Radian) in the Chersky National Park are reported. The Omulevsky cluster of the national park is interesting for its calcareous flora, which is supplemented by findings of Cypripedium calceolus and Bucegia romanica. These species are protected at the federal level. The genus Arctostaphylos is new to the Magadan Region. The isolated locality of Arctostaphylos uva-ursi in the Omulevskaya Lowland is the easternmost in Eurasia, located 600–760 km or more from the nearest known localities in the Republic of Sakha (Yakutia) and Khabarovsk Territory. In the southern part of the Chersky Ridge, Triglochin maritima was known earlier from the herbarium specimens collected near Darpir Lake located in the Republic of Sakha (Yakutia).