Biosystematic studies of the Rumex acetosella complex V. Cytogeography and morphology in the Czech Socialistic Republic and a part of Lower Austria (Austria)

A cytogeographical and morphological (fruit-types and leaf-shape) study of the crítícal Rumex acetosella aggregate has been made on the basis of 38 population samples, for the most part from the Czech Socialistic Republic. In the genecological respect the populations from Bohemia and those from North and West Moravia fit into the pattern earlier found in West and Central Europe (i.e. they are 6x, mainly angiocarpous, and have non-dissected leaf lobes). Samples from the xerothermic region of South Moravia and parts of Slovakia and adjacent Austria are thought to be related to the Balkan population group (mainly 4x, gymnocarpous and with much dissected—multifid—leaf lobes). Evidence of introgressíve hybridisation from the 4x into the 6x ploidy-level has been found in the region of the well known migration route through the Moravian Gate.