G.A. Nevidomov - Student, State Pedagogical University of Nizhny Novgorod city, Russia. E-mail: george_@nm.ru
E.V. Nevidomova - Ph.D. (Biol.), Associate Professor, State Pedagogical University of Nizhny Novgorod city, Russia. E-mail: elena. nevidomova @ yandex.ru
A.V. Lessin - Student, State Pedagogical University of Nizhny Novgorod city, Russia

Chelidonium majus L. - the most valuable medicinal plant. Often a weed. сoenopopulations Chelidonium majus examined in oak forests varying degrees of disturbance to the natural monument «Striginsky Forest» by plots. Do Chelidonium majus measured stem height, length and width of lamina of basal leaves, petiole length of basal leaves, the length of the peduncle, the diameter of the corolla. Оak forest fern experiencing significant anthropogenic pressure, as early spring shoots of bracken Pteridium aguilinum (L.) Kuhn. harvested as a food plant, and in the summer and autumn of bracken local population collects bouquets. [1, 2]. Skirts the trial area oaks fern Chelidonium majus. The abundance of Chelidonium majus solitaries, projective cover 20 %. Stem height Chelidonium majus 41±0.97 cm, length of lamina 8±0.35 cm, length of the petiole of basal leaves 4±0.48 cm, length of peduncle 2±0.32 cm, diameter of the corolla 1.2±0.07 cm. Сoenopopulations Chelidonium majus vegetates, flowering, fruiting. Appearance in the oak forest Chelidonium majus as a weed plant, confirms its disturbance [3]. In the oak forest celandine-nettle-grassland dominants herb-tiers are celandine and nettle (Urtica dioica L.). For the tree layer is characterized by a very strong thinning, is the result of deforestation, although the road - there is no network, few people dare go to nettles. Under the thickets of celandine and nettle can be found and other ruderal species is murine peas Vicia cracca L., Glechoma hederaceae L., Convolvulus arvensis L., rarely found Lysimachia nummularia L. and meadow-forest species common Agrimonia eupatoria L. Cоenopopulation Chelidonium majus quite plentiful. Morphological parameters shoots Chelidonium majus are quite high, so the average height of the stem 80±0,6 cm length of the leaf blade of basal leaves 20±0.65 cm, petiole length 10±0.31 cm, length of peduncle 5,0±0,78 cm, diameter corolla 1,5±0,12 cm. Indicators nettle in the oak forest celandine-nettle-grassland is very high, it grows here so profusely that closes its aerial parts - socialis, projective cover of around 100 %. We conclude that the emergence of Chelidonium majus and Urtica dioica L. as a dominant herb - tier oak, as well as the emergence of weeds and meadow plants assektatorov disclose a violation of oak, so necessary arrangements for renewal oak forests.