Cytogenetical Studies on Achene Colour Polymorphism of Picris asplenoides L. and Urospermum picroides L. (Asteraceae) in Egypt

Amal A. Abd El-Wahid, Magda I. Soliman, Reda M. Rizk and Rehab M. Rizk

Pakistan Journal of Biological Sciences 12 ( 7 ): 565 - 573 , 2009