“…3,6,7,[10][11][12][13][14][15] The essential oils of these three Conyza species have been the subject of previous studies. 5,8,9,[16][17][18] Despite the existence of specific morphological characteristics, distinction among the three species shows several difficulties, mainly due to the existence of hybrids. The objective of this study was the investigation of the volatile constituents of the three Conyza species growing in Greece at three phenological stages in order to identify possible differences, which could be used as a supplementary taxonomic tool in these closely related species.…”