In the Botanical Garden - Center for Biological Diversity Conservation, Polish Academy of Sciences, about 700 accessions of genus Malus Mill. have been collected since 1987; among them 164 genotypes of 51 species and decorative forms and 550 old, historical cultivars. Majority of the species are known from natural stands, e.g. M. sylvestris, M. sargentii, M. coronaria, 9 are the crossings, e.g. M. x arnoldiana, M. x micromalus, 5 are decorative cultivars, e.g. Hillieri, Red Tip, Dolgo. Seedlings population of M. sieversii coming from Central Asia, considered as the main progenitor of cultivated apple trees counts 100 individuals. An attempt was made to classification of collected materials from systematic point of view. There are some inconsistences in case of the 7 taxa, e.g. M. ellerwangeriana it is actually M. pumila f. apetala, M. glaucescens does not have characteristics of Chloromeles series and M. baccata var. flavescens does not belong to Baccata. There is lack of information in the literature on 5 taxa: M. odorata, M. flexilis, M. penzenskiana, M. upsaliensis and M. baccata var. flavescens. Lot of the apple trees have beautiful decorative flowers and fruits, e.g. M. hupehensis, M. toringoides, M. sylvestris from Buttstadt. The trees of 6 taxa were free from scab symptoms, e.g. M. florentina, M. fusca. The seedlings of M. sieversii appeared to be susceptible to diseases, only 2 genotypes were free from the scab symptoms.
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