On the circumscription of Isatis tinctoria L. (Brassicaceae) in Iran

In the course of preparing a revision of Isatis L. and its allies in Iran, we verified Isatis tinctoria L. among the material studied. Although it has been previously recorded for Iran, we give a more extensive description and a map of its distribution in Iran. A key to distinguishing this species from its allies and a discussion of the affinities in this group are provided.