Černá listina vymizelých taxonů květeny České republiky a Slovenské republiky?

A Black List of taxa disappeared from the flora of the Czech and Slovak Republics has been compiled, originally having been prepared for the Red Data Book of the two countries. The disappeared flora is classified into extinct taxa, missing taxa, unclear cases and cases requiring a detailed study; characteristics of these categories are given. An appendix to these categories includes necessary transfers from the disappeared flora to the presently existing flora (new findings, corrections of earlier erroneous classification). Lists of taxa are given for the two countries according to the accepted classification. The discussion includes results of comparison of disappeared floras of the two republics, and some comparison with several neighbouring countries. The greatest loss refers to segetal flora, Submediterranean element, and to flora of lowlands and hill-countries. The main reasons of disappearing of taxa are mentioned. In comparison with the Slovak Republic, the flora of the Czech Republic has suffered from a more substantial loss, both in terms of the number of disappeared taxa and of the rate of the process of biodiversity impoverishment. Greater loss refers to plants reaching boundaries of their distribution area in the area studied or having there isolated localities or a part of their discontinuous distribution.