New notes on Acer L. species in Iran

The genus Acer belongs to the family Sapindaceae, about 156-124 species. Acer, as one of the largest genera of the Sapindaceae, is distributed in Asia, Europe, North America and North Africa. It has 16 sections in recent categories. Eight species have been mentioned in different sources for Iran and Alborz and Zagros Mountains are the main centers of distribution of this species in Iran. The most important characteristic of this genus is that it has two winged nuts or bisamara as well as its opposite leaves. In line with the phylogenetic revision of the species, A. gilanense is introduced to the world for the first time. In this study, due to the close affinity of the new species with A. cappadocicum var. stenocarpum, compared with it. Investigations have been carried out using morphological features, intergenic spacer regions (ITS), and micro-morphological study of Samar fruit. A new identification key for Acer species is also presented in Iran.