En conformité avec les règles du code de nomenclature phytosociologique, les auteurs valident par la désignation de lectotypes, les unités supérieures et les associations non valablement décrites, qu’ils avaient publiées dans divers travaux relatifs à la végétation de la Méditerranée Orientale. Un certain nombre de modifications mineures sont apportées dans la désignation des syntaxa.

Herbarium specimens of all except one of the 168 recognized species of Alyssum Linnaeus have been analysed for their nickel content in order to identify hyperaccumulators ( > 1000 μg per g dry mass) of nickel. A further 31 hyperaccumulators (all in section Odontarrhena) were dis­covered in addition to the 14 European species reported earlier. Pot trials on the non-accumulator A. serpyllifolium Desfontaines and the hyperaccumulator A. pintodasilvae Dudley in ed. involving addition of nickel to the medium in which the plants were growing, showed that not all species of section Odontarrhena were able to act as hyperaccumulators of nickel. Hyperaccumulation occurred almost exclusively in the eastern Mediterranean area and Turkey. There appeared to be a definite cor­relation between species diversity, proliferation and endemism on the one hand, and extremely high nickel concentrations ( > 1 %) on the other. The data have been used to assess the evidence for promoting section Odontarrhena to generic rank.

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SynopsisThere are 3 types of climate in Turkey: Mediterranean, Continental and Oceanic. The greatest part of the country, including much of the montane area, comes under the influence of various types of Mediterranean climate; the Continental climate occurs in two distinct areas in N and NE Anatolia; the Oceanic climate prevails in the region bordering the Black Sea. The forest vegetation of Turkey may also be divided into 3 main classes: QUERCETEA ILICIS; QUERCETEA PUBESCENTIS; QUERCO-FAGETEA. The first is confined to a coastal zone of the Mediterranean, the second is throughout the inner Mediterranean area, the last is in the Euxine zone of N Anatolia. Steppe vegetation belongs to the class ASTRAGALOBROMETEA widespread in C Anatolia and the Taurus.

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