Abstract
480 spikes from 16 populations of <em>Carex arenaria</em> L. planted in an experimental garden were collected and analysed for 4 female and 4 male glumes each. The characteristic of the interpopulational differentiation on the area of Poland was based on multivariate analysis, Student t-test and the coefficients of variation. The separateness of three populations from the isolated inland stations - 3(Góra), 11 (Tuczno), 15 (Poznań) and individual character of - 2 (Wisełka), 6 (Sobieszewo) from the coast and 9 (Ołobok) from Lower Silesia is shown. The lowest level of variation and in consequence a particular usefulness for taxonomic considerations have two characters - a and a' (length of female and male glumes). The obtained pattern of interpopulational differentiation may be caused by various factors - migration routes on the Polish territory; selection pressures associated with different ecological conditions present in fixed dunes along the Baltic Sea coast and in isolated inland stations, occupied by <em>C. arenaria</em>; reduction of an extensive primary populations to markedly smaller isolated subpopulations.
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