Isatis L ., Sp. Pl.: 670. 1753.

Tribe: Isatideae DC.

Notes. – Isatis is Eurasian genus of some 94 species centered primarily in SW Asia. As indicated by DAVIS (1964, 1965b), the genus is taxonomically rather difficult due to the high morphological variability and overlap among related taxa. Indeed, without mature fruit, identification of species becomes tentative at best.

Extensive molecular, morphological, and cytological studies are needed to understand the sources of taxonomic complexity and evolutionary history of the genus.