This paper presents the distribution dynamics, soil and phytocoenotical conditions of the occurrence of Carex pulicaris and Pedicularis sylvatica at the margin of their range in NW Poland. Dynamic cartograms of these species were made on the basis of our field studies and available contemporary and historical records. The studies showed that the plants grow on organic hemic-muck soils, mucky soils and typical muckous soils. The occurrence of these two species on different types of soils proves that they are able to adapt easily to varying habitat conditions of post-bog areas. Populations of C. pulicaris and P. sylvatica were most frequently not numerous and occurred in small community patches. Analyzed phytocoenoses with C. pulicaris have been classified as the community of the alliance Caricion davallianae or the alliance Molinion. Phytocoenoses with P. sylvatica are represented by the association Nardo-Juncetum squarrosi and the community of the class MolinioArrhenatheretea. The distribution dynamics of these species shows that they are disappearing from some parts of this region, which proves the recessive trends. This process is more intensive for P. sylvatica, which should be included in the red list of Polish plants like C. pulicaris. The disappearance of the populations of both species has been caused by worsening habitat conditions (insufficient moisture, eutrophication), expansion of competitive plant species and land abandonment.
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.Zmienność morfologiczna Platanthera chlorantha (Orchidaceae) w lasach północno--zachodniej Polski Słowa kluczowe morfologia, zmienność warżki i ostrogi, PCA, Nadleśnictwo Dobrzany i Karnieszewice Streszczenie Badania terenowe przeprowadzono w latach 2011-2012 na obszarze Nadleśnictwa Dobrzany i Karnieszewice (NW Poland). Celem badań było sprawdzenie hipotezy o zmienności morfologicznej podkolana zielonawego (Platanthera chlorantha). Zmierzono 174 okazy i statystycznie przeanalizowano 16 cech morfologicznych; szczególną uwagę zwrócono na wielkość warżki i ostrogi. Na podstawie przeprowadzonych analiz stwierdzono, że 1) zmienność cech morfologicznych badanych okazów prezentuje poziom niski; 2) cechy morfologiczne, takie jak: wielkość warżki, ostrogi, zalążni, przysadek, płatków bocznych i liści oraz wysokość roślin statystycznie istotnie różnią okazy z badanych stanowiskach; 3) nie ma wyraźnych różnic między wielkością warżki i ostrogi u okazów rosnących w cieniu i w miejscach słonecznych.
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