Phytocoenological Study and Assessment of Coenopopulations of Some Species of the EuphorbiaceaeDistributed in Nakhichevan (Azerbaijan)

On the territory of the Nakhichevan (Azerbaijan) in 2019-2021, studies were carried out to study the groups formed by species of the Euphorbiaceae family according to the type of vegetation, search for rare and endangered species and evaluate them at the level of coenopopulations. The studies used classical geobotanical and phytocoenological methods. As a result of the research, it was found that in the local flora 35 species of the Euphorbiaceae family are distributed in 8 types of vegetation, 29 classes of formations, 87 formations and 128 associations. During the research period, 25 new phytocoenoses of the Nakhichevan were identified. A phytocoenological classification of groups, which include endangered species of the genus Andrachne, is given, and their ontogenetic status is studied. It has been established that all coenopopulations belong to the juvenile type (since ∆ — 0.15-0.34 < 0.35 and ω — 0.23-00.33 < 0.60), therefore individuals cannot complete ontogenetic cycles. This also indicated a weakening of the recovery process and a low rate of development.