Norouzi, Maryam, Farrokh Ghahremaninejad, Ali Asghar Maassoumi, & Seyed Reza Safavi. " Anatomical studies on Scorzonera (Asteraceae) species, subgenera Podospermum and Pseudopodospermum in Iran." Modern Phytomorphology [Online], 9 (2016): 51-68. Web. 11 Apr. 2018