1. Abd El-Wahab RH, Zaghloul MS, Kamel WM, Moustafa AA (2008) Diversity and distribution of medicinal plants in North Sinai. Egypt Afr J Environ Sci Technol 2:157–171
2. Abo El-Kheir ZA, El-Fiki FA, Abd El-Kawy AM (2007) Some genetic and molecular studies on Calotropis procera. Egypt J Bot 47:17–36
3. Amritphale D, Gupta J, Iyengar S (1983) Germination polymorphism in sympatric populations of Calotropis procera. Oikos 42:220–224
4. Batanouny KH (1999) Wild medicinal plants in Egypt. The Palm Press, Egypt, pp 128–129
5. Bekhit MM, El-Shawaf IS, Hassan AM, El-Saied FM, Masoud IM (2008) Genetic distances between three Ushaar (Calotropis procera (Ait)f.) genotypes as measured by RAPD and ISSR techniques. The fourth conference of sustainable agricultural development, Benha University, Egypt