The paper describes the vascular flora and plant communities of the Łacha Farna Old River-bed area of ecological use which is situated in Wrocław city (SW Poland). The full list of recorded plants comprises 173 taxa. The most interesting plant is Ceratophyllum submersum (the rare species in Lower Silesia LC category). The vegetation is also strongly differential 41 plant communities belonging to 8 classes occur here. The two richest classes are: Phragmitetea australis and Artemisietea vulgaris (10 communities found for each). There is only locality of Ceratophylletum submersi association (Potametea class), never recorded earlier on the area and its vicinity. The paper also provides precise descriptions of the localities examined to be used later for all the subsequent comparisons to identify the directions of changes within the studied oxbow lake. The distribution of the analysed localities and protected species is shown as Fig. 1. All the features of the investigated area confirm that it should be protected by local authorities.
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