On the issue of hybridogenic origin of Bidens × decipiens Warnst.
The hybrid origin of the Bidens × decipiens species, which was earlier ascribed to the North American alien species B. connata, was confirmed by analyzing the nucleotide sequences of the ITS nuclear site. The name "B. connata" is indicated as invalid for a taxon that does not grow in North America. Earlier, we tested the hypothesis of hybrid origin of B. × decipiens using ISSR analysis and revealed that B. × decipiens can be considered as a complex of hybrids and backcrosses of B. cernua and B. frondosa. Analysis of the Internal transcribed spacer (ITS) and the trnL-trnF intergenic spacer confirmed the hybrid origin of this taxon and made it possible to establish that B. cernua is the maternal species and B. frondosa with a high probability is the paternal species of the taxon.