Abstract
<p>The work concerns the occurrence conditions <em>Drosera anglica.</em> (EN) within the site located 10 km from the village of au nord Końskie near the Czarna River. The species is very dispersed but in a few places the density was 5-10 of specimens per 1m<sup>2</sup>. This species grows within a patch which is poor in terms of its flora. No significant expansion of trees or shrubs has been noted. This is related to quite a high level of water. Such conditions are favourable to the development of another species under threat of extinction, <em>Rhynchospora alba. </em>Plant-based patches with participation of sundew are heterogeneous in terms of syntaxonomy. Presence of species has been observed, e.g. from the classes of <em>Phragmitetea </em>and <em>Scheuchzerio-Caricetea nigrae</em>. Soil analyses indicate that the soils under observation are not very acidic, with average content of CaO and ash content which is optimal for this species with the ratio of C:N which indicates a temporary mire. The content of heavy metals is in norm and poses no threat to the surroundings (Pb 64-65 ppm, Cd 2.7-2.9 ppm). Wide ranges in the analysed samples refer to chromium. They do not have an adverse effect on the development of <em>Drosera anglica</em>. A very crucial threat is the consequence of succession, competition and hydrological conditions.</p>
Highlights
A total of 15 species belong to the genus Drosera [11]
The sustainability of the D. anglica population depends on the production of a large amount of seeds [18]. in conditions of strong eutrophication or mechanical devastation of habitats, this trait is not suficient for the survival of the species
An interesting observation is the quite large share of the rare Rhynchospora alba. specimens of this plant species were not found in the surrounding patches. it was advisable to take a loristic inventory of the patch where D. anglica was found
Summary
A total of 15 species belong to the genus Drosera [11]. Most of the species were found in Australia and in Southern Africa. In Poland, in addition to the three sundews: Drosera anglica huds., Drosera intermedia hayne and Drosera rotundifolia L., there are hybrids of these species. Drosera anglica occurs in the central and northern parts of Europe as well as North Asia and North America. In conditions of strong eutrophication or mechanical devastation of habitats, this trait is not suficient for the survival of the species. There are situations where D. anglica appears in unusual conditions. Studies involving more extensive plant material from many sites should be conducted to determine the resistance threshold of D. anglica to some chemical factors, including e.g. heavy metals
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