Hypericum perforatum augimviečių ekologinė bei fitocenologinė charakteristika [Ecological and phytocenological characteristics of Hypericum perforatum habitats]. – Botanica Lithuanica, 6(3): 243–256

Results of the investigations of Hypericum perforatum habitats are presented. The stands where H. perforatum is the most abundant belong to the Agropyrtialia repentis communities. H. perforatum from these habitats could be used for the exploitation or raw material. The second group of habitats comprises the communities of the Trifolio-Geranietea sanguinei and Festuco-Brometea classes, Molinietalia and Festuco-Sedetalia ord,ers, and Cynosurion cristati association. The habitats differ by the content of soil nutrient (N, P, K, humus) and acidity. On the basis of cluster analysis, the similarity of habitats basing on soil chemistry was defined. H. perforatum demonstrates a significant ecological plasticity.

Keywords: Hypericum perforatum, habitats, anthropogenic communities, cluster analysis.