Chromosome numbers in Hieracium and Pilosella species (Asteraceae) from the Iberian Peninsula and the Balearic Islands |
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Authors: | MERCEDES CASTRO GONZALO MATEO JOSEP A ROSSELLÓ |
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Institution: | Facultad de Agronomia, Universidad Central de Venezuela, Apartado 4579, 2101 Maracay, Venezuela; JardíBotànic, Universidad de Valencia, c/Quart 80, E-46008 Valencia, Spain |
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Abstract: | Mitotic chromosome numbers are reported from 16 Hieracium and two Pilosella species from the Iberian Peninsula and the Balearic Islands that are little known cytogenetically. The chromosome numbers of Hieracium aragonense Scheele (2 n = 27, 36), H. compositum Lapeyr. (2 n = 27), H. murcandidum G. Mateo (2 n = 27), H. spathulatum Scheele (2 n = 27), H. segurae Mateo (2 n = 27), H. teruelanum Mateo (2 n = 27), H. valentinum Pau (2 n = 27), Pilosella pseudovahlii (De Retz) Mateo (2 n = 18), and P. tardans (Peter) Sójak (2 n = 36) were determined for the first time. New cytotypes were detected in H. cordifolium Lapeyr. (2 n = 27) and H. loscosianum Scheele (2 n = 36). The karyotype of the studied species was similar in overall morphology and comprised metacentric and submetacentric chromosomes; secondary constrictions (up to two) were detected in the chromosome complements of some species. © 2007 The Linnean Society of London, Botanical Journal of the Linnean Society , 2007, 153 , 311–320. |
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Keywords: | apomicts endemic species intraspecific polyploidy Mediterranean flora |
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