In the present article dynamics of approach phenological phases of development of plants, terms of the beginning, the termination and duration of phenological cycles at plants which is under continuous impact of seasonal changes of the geographical environment and seasonality of climatic conditions is shown, adapting to which plants essentially change rhythmics of processes of growth and development that as a whole is reflected in a phenological condition. On the basis of supervision for this. Rosaceae Juss. five are allocated phenological rhythms of development on terms of flowering of plants. 56 types of plants of family Rosaceae Juss with various timeframes of flowering on which are allocated is possible to make a phenological spectrum of duration of flowering of types for the given family. Recently in view of climate change deviations from target dates of flowering and accordingly timeframes of fructification that it is necessary to reveal and consider for an establishment of precise phenological dates of types of plants are observed.

One of problems of modern botany is studying variety of vital forms of the plants meeting in various ecological conditions, plants reflecting morphological fitness to dominating conditions of growth of the given region. Vital forms are characterized not only габитуальными by signs which are convenient for their distinction, but also a number of biological properties among which especially important are: life expectancy, a rhythm of progress, a way of a feed, ways of vegetative duplication. The ecological analysis of types this. Rosaceae Juss. Has shown, that the majority of the types meeting in flora of the Belgorod area, conform to forest-steppe and steppe character of the given region. Trees of 9 types (16,07 %), grassy perennial plants with a rod root of 8 types (14,28 %), grassy perennial plants with a rod root – 2 types (3,57 %), also introduce the insignificant contribution Grassy perennial plants with a rhizome in the form of a tuber, grassy perennial plants with a creeping rhizome, amphibious grassy perennial plants with a creeping root. A key position in this. Rosaceae Juss. Borrow not moistureloving and moistureloving on 26 types (on 46,42 %), including actually moistureloving 26,78 % (15 types) and an average degree moistureloving 19,64 % (11 types), actually moistureloving 30,35 % (17 types) and moistureloving in an average degree of 16,2 % (9 types). The revealed plenty drought-resistant and moistureloving in structure of studied family speaks a lot of types a part radical wood and bushes of communities of plants growing on marges. Especially demanding plants to a moisture this. Rosaceae growing in crude seats (5,37 % 3 types: Potentilla anserina L., Geum rivale L., Filipendula ulmaria Maxim.) and growing on a bog (1,79 % Comarum palustre L.) play an insignificant role in ecological structure in flora of the Belgorod area.