A putatively endemic infraspecific taxon of Hieracium villosum group from the northern Apennines was investigated from nomenclatural, morphological and karyological points of view. H. villosum Jacq. var. zangherii Vignolo-Lutati proved to be invalidly described, and for its morphological features was referred to H. dentatum Hoppe subsp. xanthostylophorum Furrer & Zahn, a taxon hitherto only known from Abruzzo (Central Apennines). Karyological investigations resulted in the first report for an Italian specimen belonging to the collective species H. dentatum. H. dentatum subsp. xanthostylophorum proved to be tetraploid, with a formula 2n = 4x = 36 = 2M + 14m + 18sm + 2st. Chromosomes were generally of large size and showed a low degree of polymorphism in their shapes. The karyological parameters of H. dentatum subsp. xanthostylophorum have been compared with some available karyological parameters from literature, belonging to related entities of Hieracium subgen. Hieracium. The Italian Hieracium subgen. Hieracium populations proved to have the most asymmetric karyotypes with respect to other European populations. H. dentatum subsp. xanthostylophorum showed an intermediate karyotype asymmetry between Hieracium subgen. Hieracium populations of the Balkan Peninsula and those of southern Tuscany. From a broader point of view, this study confirms in the northern Apennines a trend pointed out in other central and southern European mountain areas: the core taxon (H. villosum) is surrounded by tetraploid apomictic lineages that show some morphological characters of other Hieracium species, in the case of H. dentatum subsp. xanthostylophorum (= H. villosum “var. zangherii”), characters of H. bifidum.

Karyological and morphological investigations on a Hieracium putatively endemic to the National Park “Foreste Casentinesi, M. Falterona, Campigna” (northern Apennines, central Italy) / Viciani D.; Fiorini G.; Gonnelli V.; Gottschlich G.. - In: CARYOLOGIA. - ISSN 0008-7114. - STAMPA. - 66 (2):(2013), pp. 154-161. [10.1080/00087114.2013.821841]

Karyological and morphological investigations on a Hieracium putatively endemic to the National Park “Foreste Casentinesi, M. Falterona, Campigna” (northern Apennines, central Italy).

VICIANI, DANIELE
;
FIORINI, GRAZIANA;
2013

Abstract

A putatively endemic infraspecific taxon of Hieracium villosum group from the northern Apennines was investigated from nomenclatural, morphological and karyological points of view. H. villosum Jacq. var. zangherii Vignolo-Lutati proved to be invalidly described, and for its morphological features was referred to H. dentatum Hoppe subsp. xanthostylophorum Furrer & Zahn, a taxon hitherto only known from Abruzzo (Central Apennines). Karyological investigations resulted in the first report for an Italian specimen belonging to the collective species H. dentatum. H. dentatum subsp. xanthostylophorum proved to be tetraploid, with a formula 2n = 4x = 36 = 2M + 14m + 18sm + 2st. Chromosomes were generally of large size and showed a low degree of polymorphism in their shapes. The karyological parameters of H. dentatum subsp. xanthostylophorum have been compared with some available karyological parameters from literature, belonging to related entities of Hieracium subgen. Hieracium. The Italian Hieracium subgen. Hieracium populations proved to have the most asymmetric karyotypes with respect to other European populations. H. dentatum subsp. xanthostylophorum showed an intermediate karyotype asymmetry between Hieracium subgen. Hieracium populations of the Balkan Peninsula and those of southern Tuscany. From a broader point of view, this study confirms in the northern Apennines a trend pointed out in other central and southern European mountain areas: the core taxon (H. villosum) is surrounded by tetraploid apomictic lineages that show some morphological characters of other Hieracium species, in the case of H. dentatum subsp. xanthostylophorum (= H. villosum “var. zangherii”), characters of H. bifidum.
2013
66 (2)
154
161
Viciani D.; Fiorini G.; Gonnelli V.; Gottschlich G.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/800509
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