Bioecological characteristics and decorative representatives of the genus Robinia L. according to phonological data

The object of research was the species, varieties and forms genus Robinia: R. viscosa var. hartwegii (Koehne) Ashe; neomexicana rusbyi; f. pale pink; purple; pseudoacacia L.; pyramidalis (Pepin) Rehd.; umbraculifera (DC) Rehd. x neomexicana, growing in dendrological collections Federal Research Center Agroecology, Russian Academy Sciences. Most phenological phases representatives Robinia occur at optimal time for seasonal development flowering woody plants. This belongs to group late beginners terminators season. indicator atypicality (+1 - 0) is lower half normal area, some species (R. Hartwegii, Pyramidalis, Umbraculifera) edge area (+ 0.8 +1). these introduced northern border wide range culture their further promotion regions with a more severe climate possible only experimental plantations or as an additional assortment. most winter-hardy were varieties, hybrids index from +0.3 +0.35. We can recommend plants widespread use even Volgograd region due potential winter hardiness. study rhythms revealed periods maximum decorativeness generic complex Robinia, comparative characteristic terms beginning end flowering. authors found that var has longest period.