Abstract
The authors describe the locality of a so far in Poland unknown species <em>Coleanthus subtilis</em>. It was discovered on the Oleśnica Plateau near Wroclaw. This grass occurs on a surface of ca. 15 ha, round muddy shores of fishponds. The large stand makes the impression to be at least 50-year old. Together with the grass of our interest there grow also other, not frequent to day, species like <em>Veronica peregrina</em>, <em>Myosurus minimus </em>and <em>Limosella aquatica</em>. The traditional management of fishponds makes the basis of maintenance of all the species and the whole community. The constant filling with water of the reservoirs and application of fertilisers threatens the existence of the whole rare and interesting ecosystem.
Highlights
The flora of every area has, on one hand, stable properties, resulting from the local, usually longer past, as well as, the contact of plants with the habitat
The distribution area of Coleanthus subtilis includes five geographical centres, which are widely separated by disjunction, measuring several thousand kilometres, i.e. the Western and Central European, Western Siberian, Amur Basin, and American ranges (Neèajev and Neèajev 1972; Hulten and Fries 1986; Fedorov 1999)
The origin of centre of occurrence of this species in the Czech and Slovakian Republics is connected with existence of habitats proper for this grass, and with the refuge formed by the mentioned territories situated beyond the area of the last European glaciation
Summary
The flora of every area has, on one hand, stable properties, resulting from the local, usually longer past, as well as, the contact of plants with the habitat. It is characterised by its peculiar dynamics. In a new elaboration Èeøovský et al (2000) informs that the locus classicus of the species under discussion, as well as its genus, is situated on the Czech territory (Osek near Hoøowic). The origin of centre of occurrence of this species in the Czech and Slovakian Republics is connected with existence of habitats proper for this grass (numerous fishponds with muddy soils), and with the refuge formed by the mentioned territories situated beyond the area of the last European glaciation
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