On the Tertiary history of genus Acer Linneus in Bulgaria

Abstract

The taxonomic composition has been established and the development has been traced back of genus Acer L. in the Tertiaty flora of Bulgaria. The palaeofloristic data up to now, prove the existence of 15 species belonging to 8 sections: Acer. Goniocarpa, Ginnala, Rubra, Campestria, Platanoidea, Trifoliata and Palmata. Acer protohyrcanum is described as a new species. The evolution of the genus in Bulgaria is characterised by three main stages. The most considerable development of the genus takes place during the Miocene.