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This the fourth part of the series on the distributions of vascular plants in the Czech Republic includes grid maps of 84 taxa of the genera Aldrovanda, Alisma, Asclepias, Azolla, Blechnum, Botrychium, Butomus, Carex, Centaurea, Drosera, Dysphania, Hypochaeris, Illecebrum, Luronium, Ophioglossum, Persicaria, Pilularia, Rubrivena, Sagittaria, Salvinia, Scirpoides, Sideritis, Streptopus, Teesdalia and Thesium. These maps were produced by taxonomic experts based on herbarium specimens, literature and field records. Of the native taxa studied, 40 are on the national Red List. Spatial distributions and temporal dynamics of individual taxa are shown in maps and documented by records included in the Pladias database and available in electronic appendices. The maps are accompanied by comments, which include additional information on the distribution, habitats, taxonomy and biology of the taxa.
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