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On rupicolous vegetation (cl. Asplenietea trichomanis) of the Betic ranges in south Spain. The endemic alliance Saxifragion camposfi developed in the upper zones of this area is here thoroughly examined.Phytosociological tables with records of all the syntaxa and biogeographical, ecological and floristic data among others are shown. Finally, as a result of a profound syntaxonomical discussion and the last data available the synopsis of this alliance is completed with four new associations: Hieracio texedensiMoehringietum tejedensis, Athamanto hispanicae-Sideritetum stachydioidis, Sileno andryalifoliae-Saxifragetum camposii, Jasiono minutae-Saxifragetum rigoi. ResumenSe estudia la vegetaci6n rupicola (cl. Asplenietea trichomanb) de las Cordilleras B6ticas, emplazadas en el sur de Espafia. En los territorios mils elevados de estas se desarrolla la alianza end6mica Saxifragion camposii, cuya revisi6n completa se realiza en este trabajo. Se aportan tablas fitosociol6gicas de todos los sintilxones, asi como datos de tipo biogeogrifico, ecol6gico, floristico, etc. Como resultado de una profunda discusi6n sintaxon6mica y con los nuevos datos disponibles, se completa el esquema de la mencionada alianza con cuatro asociaciones nuevas (ver resumen en ingl6s).Nomenclature: The taxa names are given according Castroviejo et al.

Abstract.-The syntaxa of Omphalodion commutatae (Trachynietalia distachyae, Helianthemetea) are examined as regards to their floristic, ecological and biogeographical characteristics, and the new association Sileno lasiostylaeArenarietum tenuis is described. A correspondence analysis (CA) has been carried out and, as a result of it, the relationships between the different syntaxa in the alliance are reviewed.Key words : therophytic vegetation -mafic communities -correspondance analysis -phytosociology -Spain.Resume.-On dresse dans un premier temps un etat des caracteres flo ristiques, ecologiques et biogeographiques des syntaxons appartenant a !'alliance Ompha/odion commutatae (Trachynietalia distachyae, Helianthemetea) puis nous decrivons Ia nouvelle association Sileno lasiostylae-Arenarietum tenuis. Nous en analysons Ia d1sposition (CA) et, en nous basant sur les resultats des analyses, nous interpretons les rapports entre les divers syntaxon qui camposent !'alliance.

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