Segetal communities of the Suwałki Lakeland (Pojezierze Suwalskie). Fragmenta Floristica et Geobotanica Polonica 7: 167–208. Kraków. PL ISSN 1640–629X. ABSTRACT: The paper presents the results of research on plant communities in arable fields in the Suwałki Lakeland (Pojezierze Suwalskie), i.e. the northeastern most region of Poland, where the climate is the coolest and most continental. This young glacial area has a hilly relief and numerous lakes. Farming intensity is relatively low. I have described 9 types of segetal communities of this area: 7 in cereal fields and only 2 in root crops fields. Among the recognized communities I have identified 3 cereal associations and 1 of root crop association. Two of these associations – Papaveretum argemones and Vicietum tetraspermae occur in very poor forms since they are at the north eastern limit of their geographical range. The Papaveretum argemones does not develop the spring aspect here, whereas the Vicietum tetraspermae developes solely in the acidophilous subassociation of sperguletosum. The root crop field association – Fumarietum officinalis occurs in the Suwałki Lakeland beyond its hitherto recognized western limit of its geographical range. I have distinguished one new association – Medicagini falcatae Consolidetum regalis with three character species: Consolida regalis, Medicago falcata and Anthemis tinctoria. It develops on hill slopes and peak areas covered with stony gravel soils. The association is divided into two subassociations – typical and papaveretosum dubii. It is the most common community in the Suwałki Lakeland.
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