Biodiversity and forest plant species: analysis and conservation. Trees architecture, life forms, growth, root systems. Vegetation. Systematics, morphology, ecophysiology, corology of Taxaceae, Pinaceae, Taxodiaceae, Cupressaceae, Platanaceae, Ulmaceae, Fagaceae, Betulaceae, Tiliaceae, Salicaceae, Rosaceae, Fabaceae, Hippocastanaceae, Aceraceae, Simaroubaceae, Oleaceae. The R software for phytodiversity analysis.