New finds of Pilosella taxa in Eastern Bohemia. Part I – Dolní Poorličí area

Finds of 18 species of the genus Pilosella from the Dolní Poorličí area are published. Five basic species (Pilosella aurantiaca, P. bauhini, P. caespitosa, P. officinarum, P. piloselloides) and 13 hybridogenous species (hybrid P. bauhini × P. glomerata, P. brachiata, P. floribunda, P. glomerata, P. heterodoxa, P. iserana, P. macranthela, P. macrostolona, P. piloselliflora, P. polymastix, P. rothiana, P. stoloniflora and P. visianii) were found in the studied area. Thirteen taxa are new to Phytogeographic District 61 Dolní Poorličí. Most species were found at localities with vegetation in early successional stages. These were mostly pastures, markedly sparsely vegetated and regularly mowed relatively dry meadows, edges of forest trails, ruderal areas, surroundings of railway stations and sandpits, where vegetation disturbances and other types of disturbances regularly occur. Pilosella heterodoxa, P. macranthela and P. polymastix are the most significant finds in the studied area. Recently created hybrid swarms between the species P. floribunda and P. officinarum, and P. caespitosa and P. officinarum have also been found at a number of localities. These hybrid swarms were morphologically different from stabilized hybridogenous species of the known combinations. Morphotypes in these hybrid swarms could not be identified reliably.