Valsorda, Gualdo Tadino - Viola eugeniae Parl.
L. Gianguzzi1 & A. La Mantia2
1Dipartimento di Scienze Botaniche, Università degli Studi di Palermo, via Archirafi 38, I – 90123 Palermo; e-mail: firstname.lastname@example.org
2Dipartimento di Metodologie Fisiche e Chimiche per l’Ingegneria, Università degli Studi di Catania, viale AndreaDoria 6, I – 95125 Catania; e-mail: email@example.com
Phytosociological, synecological and synchorological observations on relict Petagnaea gussonei (Galio-Urticetea) vegetation in Nebrodi Mountains (NE Sicily). The results of a study on the Petagnaea gussonei vegetation are presented. This rare endemism belonging to Apiaceae is located in some relict sites of Mts. Nebrodi (NE Sicily) where characterizes the phytocoenotic aspects of the streams in the hilly and submountain belts. According to bibliographic data and to releves surveyed in each location of the distribution area, the phytosociological analysis allowed to refer this phytocoenoses to Petagnaeetum gussonei (nom. mut. propos.), as well as to define the syntaxonomic hierarchization within the Mycelido-Stachydion sylvaticae alliance (Circaeo-Stachydetaliasylvaticae, Galio-Urticetea). This association is differentiated by the presence of relict species and ebtities of phytogeographic interest. Besides, the distribution, ecology, floristic and phytocoenotic characterization were investigated. The catena links of the coenoses and the synchorological connection to other Mycelido-Stachydion sylvaticaePetagnaeetum gussonei, the Chrysosplenio-Lereschietum thomasii association, occurring in Appennino Calabro (Aspromonte, Sila e Serre S. Bruno), is characterized by a paleoendemic and taxonomically isolated species belonging to Apiaceae, Lereschia thomasii. Besides, the two phytocoenoses are in relation because of their similar ecology and floristic composition rich in elements irradiated to the south of European continent during the coolest periods of the Quaternary.
Mycelido-Stachydion sylvaticae, Petagnaea gussonei, Phytosociology, Syntaxonomy