Abstract
A syntaxonomical review of theMinuartio-Poion ligulatae (Festuco hystricis-Ononidetea striatae) in the Iberian Peninsula, supported by numerical classification (complete linkage clustering) and ordination (correspondence analysis), is presented. Communities of psychro-xerophilous calcicolous plants occur in the high mountains and “parameras” of the south and central western Iberian Peninsula, areas which suffer from severe frosts. The data collected point to three large groups of communities: those of the chorological Carpetano-Iberico-Leonesa Province; those of the Castellano-Maestrazgo-Manchega Province; and those of the Betica Province. Within the latter group, similarities and differences between the communities were analyzed and two new associations (Herniario boissieri-Festucetum hystricis andPimpinello gracilis-Festucetum nevadensis) were described. In addition, data clearly support the existence of a humidity-xericity gradient responsible for the distinction of the communities into different syntaxonomic units.
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