Taxonomic revision of "Hieracium" sect. "Cernua" (Asteraceae) in the Carpathians Sudetes and Alps

• Autores: Zbigniew Szleag
• Localización: Polish botanical journal, ISSN 1641-8190, Vol. 51, Nº 2, 2006, págs. 97-153
• Idioma: inglés
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• Resumen

  • Hieracium sect. Cernua R. Uechtr. comprises ca 40 taxa at the species level and ca 30 at the subspecies level. Most taxa occur in the Balkan Peninsula and the Southern Carpathians. This paper presents a taxonomic revision of the Carpathian, Sudetic and Alpine representatives of the section. The current 22 species, 7 subspecies and 13 varieties and forms are reduced to 16 species. A new species, H. mirekii Szel¹g, is described from the Southern Carpathians, and two other taxa are raised to species rank, as H. mitkae Szel¹g and H. polyphyllobasis (Nyár. & Zahn) Szel¹g, giving a total of 19 species recognized in the study area.

    The taxonomic position of H. zanogae Pax remains unexplained. Seventeen names are typified. Ten names are considered as not validly published and 4 names as illegitimate. Altogether 52 names exist for the 19 species recognized in this paper. Hieracium abietogenum Szel¹g, H. borbasii var. ramiciferum Nyár., H. fagarasense (Nyár. & Zahn) Nyár., H. perfoliosum Szel¹g and H. pisaturense Nyár. are excluded from H. sect. Cernua. The treatment includes a key for determination, descriptions and illustrations, and distribution maps of the 18 species. Most species are narrow endemics restricted to certain geographic areas. Biogeographical relationships within the section are discussed: (1) the occurrence of H. sect. Cernua in the South-eastern Carpathians and Apuseni Mountains as well as in the Eastern Alps is presumably a relict originating from a diploid, sexual species with a wider primary range, (2) none of the South-eastern Carpathian species are known to also occur in the Western Carpathians, (3) H. silesiacum E. Krause is a common species in the Western Carpathians and the Eastern Sudetes, whereas H.

    vierhapperi (Zahn) Szel¹g is a common species for the Alps and the Western Carpathians, (4) the significance of the �Waldkarpaten� (Forest Carpathians) range is highlighted as a potential ecological barrier limiting migration of subalpine plant species between the South-eastern and the Western Carpathians, (5) the representatives of H. sect. Cernua were able to reach the Western Carpathians and the Sudetes via the Eastern Alps, and thus circumventing the South-eastern Carpathian path, regarded as the main migration route of the mountain flora from the Balkan Peninsula.