Abstract
The number of chromosomes in metaphases root meristems of <i>Erigeron canadensis</i> L. (2n= 18) and <i>E. annuus</i> (L.) Pers. (2n=27) was determined. The chromosomes of both species showed a morphological differentiation - they were heterobrachial or isobrachial; <i>E. annuus</i> had an additional unpaired isobrachial chromosome.
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