New taxa of trees and shrubs at Peter the Great Botanical Garden

The article describes 4 new forms for science (Acer mayrii Schwer, f. pyramidale V.V. Byalt et Firsov forma nova, Acer platanoides L. f. atropurpureo-viridis V.V. Byalt et Firsov forma nova, Crataegus nigra Waldst. et Kit. f. arcuato-pendula V.V. Byalt et Firsov forma nova, Malus praecox (Pall.) Borkh. f. pyramidale V.V. Byalt et Firsov forma nova, and 2 new hybrids: Betula x zamjatninii V.V. Byalt et Firsov (Betula ermanii Cham. x B. pendula Roth.), Lonicera x zaitzevii V.V. Byalt, A. Byalt et Firsov hybrida nova (Lonicera demissa Rehd. x L. xylosteum L.) Aschers. et Graebn.) cultivated at the Peter the Great Botanical Garden in St. Petersburg. Information on the origin of planting material is given, new forms are distinguished from close taxa (Latin diagnoses are given), typical specimen and their storage locations are indicated. The article is illustrated with 7 photos.