A presented list of vascular plants of Wielkopolska comprises native and naturalized in this area alien species. This list is a result of a critical analysis of both contemporary and historical data, collected since the beginning of the 19th century. All information accessible in herbarium collections, publications and unpublished materials was used. A critical analysis was conducted at the taxonomic, nomenclatural, chorological and habitat levels, based on the verification of negative information not supported by sufficient arguments. The list is presented in an alphabetical order. Information on each species includes: family affinity, life form, geographic and historic status and threat category. In cases particularly disputable, a species standard characteristic was supplemented with an additional commentary.