Úzkolisté druhy rodu Potamogeton v květeně České republiky. I. Úvod a klíč k určování

A revision of linear-leaved species of the genus Potamogeton in the Czech Republic is given. On the basis of field investigation, cultivation experiments and herbarium studies, 8 taxa have been recognized as distinct species. Prevailing clonal reproduction, autogamy, easy dispersal on long distances, and especially extensive phenotypic plasticity are taken for the principal sources of taxonomic difficulties. Description and explanation of special morphologic terms, comments on infrageneric classification, and instructions for collecting and drying of specimens are provided. This first part of a series of papers on linear-leaved species includes also key to determination.