A REVISION OF ACER MONSPESSULANUM L. IN IRAN; A NEW SUBSPECIES REPORT

The genus Acer L., consisting of 8 species and also some subspecies and varieties, is one of the most important forest trees distributed in all floristic regions of Iran. Among them, Acer monspessulanum L. by having five subspecies has the greatest range of distribution and diversity in the genus. During a study on herbarium specimens of the Research Center of Agricultural and Natural Resources of W. Azerbayjan Province for the preparation of the flora of Iran in Persian, subspecies oksalianum which was previously reported from Turkey, was identified and is reported for the first time for the flora of Iran. A new identification key for subspecies is presented here. An illustration of the new subspecies is provided.