Resumen de Hieracium silesiacum (Asteraceae) in Poland
Hieracium silesiacum E. Krause, a subendemic species of the subalpine belt of the Western Carpathians, has been rediscovered in the Polish part of the Tatra Mts after 36 years. The collection site, on the SE slope of Giewont Mt. below Kondracka Prze³êcz pass (West Tatras), represents the only known recent locality in Poland. H. silesiacum is one of the rarest vascular plants of the Polish flora. The pattern of morphological variation and the general distribution show that H. silesiacum probably evolved in the Western Carpathians and subsequently migrated to the Eastern Sudetes, like other so-called Carpathian migrants.
Tetraploidy (2n~4x) was determined in one analyzed plant by flow cytometry, in accordance with previously published chromosome counts.
