سپیده ساجدی - Dept. of Botany, Plant Pests & Diseases Research Institute, P.O. Box ۱۴۵۴, Tehran ۱۹۳۹۵, Iran E-mail: sepidehsajedi@yahoo.com
فریبا شریف نیا - Islamic Azad University, North Tehran Branch
مصطفی اسدی - Forests & Rangelands Research Institute, Tehran, Iran

This paper presents the findings of a research on the genus Isatis L.(Brassicaceae) in Iran. Isatis specimens kept in major herbaria of Iran were examined carefully. Fresh specimens were collected from Tehran, Mazandaran, Semnan, Hamedan, Kurdistan, W. Azarbaijan , E. Azarbaijan, Ardebil and Ghazvin provinces. Images of type or otherwise valid specimens kept in Viena, Munich, Montpollier and Kew herbaria were obtained and considered in the research. The relationships between the species were also studied using numeric taxonomy method. The species of the genus Pachypterygium found in Iran were included in the numeric taxonomy beside the genus Isatis L. Hierarchical clustering analysis was carried out based on ۶۹ characteristics. Dendrograms and plots were drawn. 

Isatis, Brassicaceae, numeric taxonomy, Pachypterygium