The aim of this study was to check a hypothesis on the morphological variability of the Platanthera chlorantha growing in forests in the north-west of Poland (Dobrzany and Karnieszewice Forestries). Statistical techniques were used to analyse 16 morphological characters determined in 174 flowering specimens. A special attention was paid to the size of the spur and labellum. The following morphological characters showed statistically significant differences: spur, labellum, ovary, bract, lateral sepal, leaves and height of the specimens. The differences are most likely a result of different habitat conditions and the location of the study sites.