Chromosome numbers and reproductive systems of selected representatives of Pilosella from the Krkonoše Mts (the Sudetes Mts). Part 3.

Chromosome counts/DNA ploidy level (DNA-PL) and modes of reproduction of the following species, hybridogenous species and hybrids of Pilosella from the Krkonoše Mts (Czech Republic) are reported: P. aurantiaca (2n = 36, 2n = 45, DNA-PL tetraploid, pentaploid, all apomictic); P. bauhini subsp. bauhini (2n = 45, with a long hemizygous marker chromosome – MC, apomictic); P. caespitosa (2n = 36, 2n = 45, apomictic, both cytotypes MC); P. cymosa subsp. vaillantii (2n = 45, MC); P. lactucella (2n = 18, DNA-PL diploid); P. officinarum (2n = 36, sexual); P. blyttiana (2n = 36); P. floribunda (2n = 36, MC); P. glomerata (DNA-PL tetraploid, 2n = 45, MC, apomictic, 2n = 46, MC); P. iserana (2n = 35 + fragment, MC, 2n = 36, MC, DNA-PL tetraploid,, apomictic); P. piloselliflora (2n = 36, DNA-PL pentaploid); P. rubra (2n = 54); P. schultesii (2n = 36); P. rothiana (2n = 36, apomictic); P. scandinavica (2n = 36, MC, apomictic). In addition, a heptaploid plant (2n = 63, apomictic), probably a hybrid between P. rubra (2n = 54, reduced gamete) and P. aurantiaca (2n = 36, unreduced gamete) and a rare hybrid corresponding morphologically to P. fusca (2n = 36, apomictic), which is probably a hybrid between P. aurantiaca and P. blyttiana, were found. The latter hybrid has not been previously reported from the Krkonoše Mts or the Czech Republic. New data for P. cymosa subsp. vaillantii, P. fusca, P. rothiana and P. scandinavica for this mountain range are presented. It is shown that tetraploid and pentaploid P. aurantiaca differ in the number and shape of their stem leaves, which makes it easier to identify them in the field.