Francisco Valle Tendero

THE VEGETATION ON SCREES - A SYNOPSIS OF HIGHER SYNTAXA IN EUROPE

A synopsis of high-rank syntaxa of scree vegetation with an accompanying list of plant communities is presented. The classification of scree vegetation in only one broadly conceived class, theThlaspietea rotundifolii, throughout Europe is a new concept.The vegetation on screes was classified into 8 major groups (17 orders and 42 alliances) according to their altitudinal range and the chemistry of the parent material. Brief information on ecological conditions, phytogeographical patterns, and altitudinal distribution are given. The characteristics and important diagnostic taxa for each alliance and order classified within theThlaspietea rotundifolii are given.

The plant communities of theAsplenietea trichomanis in the SW Iberian Peninsula

The rupicolous vegetation of theAsplenietea trichomanis in the south-western Iberian Peninsula is analysed using the methods of the Zürich-Montpellier School. Phytosociological tables, and biogeographical, ecological and floristic data are given for a number of syntaxa. A phytosociological synopsis of the studied vegetation was made for the entire region. Four new syntaxa are described: theCoincyo logirostri-Dianthetum lusitani, Jasiono marianae-Dianthetum lusitani jasionetosum tomentosae, Digitali thapsi-Dianthetum lusitani conopodietosum ramosi andSedo hirsuti-Polypodietum cambrici polypodietosum interjecti.

Syntaxonomical review of the Omphalodion commutatae alliance (class Helianthemetea)

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 lasiostylae-Arenarietum 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.