Hieracium petraeum (Asteraceae): a new casual record in the Bulgarian flora

• Autores: Vladimir Vladimirov
• Localización: Phytologia Balcanica: International Journal of Balkan Flora and Vegetation, ISSN 1310-7771, Vol. 24, Nº. 3, 2018, págs. 365-368
• Idioma: inglés
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• Resumen

  • The genus Hieracium is notorious for its taxonomic complexity due to its specific reproductive system involving normal sexual reproduction, hybridization, polyploidy, and apomixis. It is one of the largest genera worldwide and in the Bulgarian flora. So far, no alien Hieracium species has been reported for Bulgaria.

    However, fieldwork in the Rila Mts resulted in the discovery of a taxon of the Hieracium amplexicaule collective species (Asteraceae), alien for the Bulgarian flora. Due to their ornamental appearance, plants from this group have been cultivated for more than 70 years in the yard of Sitnyakovo, the former King’s hunting lodge, and escaped specimens have recently been recorded in the nearby natural habitats. Most probably, they belong to H. petraeum (syn. H. amplexicaule subsp. berardianum). A concise morphological description of the Bulgarian material is provided and the alien status of the population is discussed. The genome size and ploidy level, 2n = 4x = 36, have been estimated by flow cytometry. The text is illustrated with colour photographs from the locality in the Rila Mts.