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The Ilgaz mountains are the greater mountain ranges in the north-west Anatolia. Its southern slopes are under the affects of Mediterranean climate with a less rainy or semi-aride very cold characters while the northern slopes under the affects of Oceanic climate. The Tigaz mountains are located in the prepontic region and generally covered with the conifer forests : the decidious forests are also seen on the lower levels and in the valleys exposing the north. Their higher parts are covered with the meadows and steppe vegetation is very rare. The sylvatic associations and syntaxa in which they are included are : A - The associations included in the order Fagetalia sylvaticae and the class Querco-Fagetea : 1. A. bornmuelleriana -Hieracium oblongum association 2. A. bornmuelleriana -Pinus sylvestris association 3. Finus sylvestris -A. bornmuelleriana association 3 -The associations included in the alliance Carpino-Acerion of the order Querco-Carpinetalia : 1. P. sylvestris -Q. petraea subsp. iberica association 2. The subassociations of Carpinus betulus and Fagus orientalis of the association of Q. petraea subsp. iberica C -The associations included in the alliance Quercion pubescentis and the class Quercetea pubescentis : 1. P. nigra subsp. pallasiana -Chamaecytisus pygmaeus association 2. Quercus pubescens -Lotus aegeus association D -The associations included in the order Astragalo-Brometalia and the class Astragalo-Brometea : l. Astragalus microcephalus -Asphodeline damascena association and its subassociations, Paracaryum pahlagonicum and Dianthus kamtembeluensis .

The orophilous vegetation of the sylvatic zone of Ilgaz mountains was analysed for the first time by the authors. Among these orophilous vegetation, the authors distinguished the following new phytosociological units : Hyperico-Thymetalia skorpilii order, Sileno-Astragalion densifolii and Pedicularo-Asterion alpinii alliances. Five new associations belonged to these units were described. Their floristic affinities are quite different from the Taurus and Uludag formations.

Cette recherche a été faite en Anatolie, région appartenant au groupe asiatique des marécages continentaux et au sous-groupe Aralo-Caspien. L’analyse de la végétation a été faite selon “le système d’association floristique” de Braun-Blanquet. Dans cette région, en fonction de leurs caractéristiques écologiques et floristiques, les auteurs décrivent les associations suivantes appartenant à la végétation halophytique : Cardopatio-Juncetum heldreichianii Ass. nova Puccinellio distantis-Juncetum maritimi Ass. nova Petrosimonietum nigdeenso-brachiatae Ass. nova Lepidio caespitosi-Halimionetum portulacoidis Ass. nova Cresso creticae-Halocnemetum strobilacei Ass. nova Dans la steppe proche de la végétation halophytique, les auteurs décrivent une association : l'Artemisetum Santonici Çetik (1981).