Flow cytometric results for 178 individuals of 12 Callitriche taxa, for which the genome size was determined using propidium iodide staining.

* B = Bellis perennis (2C = 3.96 pg); G = Glycine max ‘Polanka’ (2C = 2.50 pg).** 1Cx-value cannot be meaningfully calculated due to aneuploid chromosome counts of these taxa.*** Callitriche hamulata has recently been assigned to C. brutia, as C. brutia var. hamulata (Kütz. ex W.D.J. Koch) Lansdown [39], [40]. Both taxa are closely related and can be distinguished morphologically perhaps only in their fertile terrestrial forms. Nevertheless, a thorough study of the entire C. brutia complex on a large geographic scale, supported by statistical and analytical methods, is not yet available. Callitriche brutia and C. hamulata possess distinct chromosome numbers and apparently have different evolutionary histories (although the histories of both species are completely unknown and perhaps complex). In addition, their distribution and habitat requirements are partially different. For these reasons, we retain separate taxonomic treatments of these species, at least until the complex is subjected to a critical review using appropriate genetic markers and the mechanism of its origin elucidated.Flow cytometric results for 178 individuals of 12 Callitriche taxa, for which the genome size was determined using propidium iodide staining.