Wild roses and hawthorns of urban area: a case study of Pi?a in Poland

摘要

The paper presents a study on the distribution of wild roses and hawthorns in the town of Pi?a (NW Poland). The main purpose of the study was to provide a full list of wild Crataegus and Rosa taxa growing in the researched area. Field studies (2014-2015) and formerly published data made it possible to recognize 19 taxa, among them 14 native taxa (including two rose nothospecies), 4 anthropophytes and 1 hybrid. Eleven new taxa were found in the explored area during the studies. These were: Crataegus rhipidophylla , C. × macrocarpa , C. × subsphaericea , C . × media ‘Rubra Plena’, Rosa majalis, R. villosa, R. rubiginosa, R. × subcollina, R. glauca, R. rugosa, R. multiflora and interspecific hybrid Rosa canina × R. rubiginosa .