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In Lower Silesia, three goldenrod species introduced from North America are found: Solidago gigantea Aiton (late goldenrod), S. canadensis L. (Canadian goldenrod) and S. graminifolia (L.) Elliott. (grass-leaved goldenrod). A native species is also found: Solidago virgaurea L. (common goldenrod). Distribution of these species was surveyed using sampling plots in a 10x10 km grid. The impact of increasing...
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