New forms of maples (Acer L., Aceraceae) cultivated at Peter the Great Botanic Garden (St. Petersburg, Russia)

The article contains description of two new maple forms - Acer miyabei Maxim. f. suberosum Byalt et Firsov forma nova (Aceraceae) and Acer saccharinum L. f. variifolium Byalt et Firsov forma nova – cultivated at Peter the Great Botanic Garden of the Komarov Botanical Institute RAS in St. Petersburg, Russia. The article contains a brief history of the introduction of A. miyabei Maxim. and A. saccharinum L., information about the origin of the planting material in the park of the botanical garden of RAS, basic differences between the new forms and similar taxa (incl. Latin diagnoses), as well as data about standard samples and their storage. The article has color photos of the alive plants located in the botanical garden of RAS. Both maple forms are very decorative and appear to be very useful for a large-scale implementation in the urban landscape planting.