1. Simpson MG. Plants systematics (2nd ed.). New York: Elsevier Academic Press; 2006.
2. Collentte S. Wildflowers of Saudi Arabia. London: Meteorology and Environmental Protection Administration, Scorpion Publishing; 1999.
3. Thomas J. Flora of Saudi Arabia-checklist; 2011. http://www.plantdiversityofsaudiarabia.info/Biodiversity-Saudi-Arabia/Flora/Checklist/Cheklist.htm.
4. Secondary metabolites of plants and their role: overview;Pagare S;Curr Trends Biotechnol Pharm,2015
5. Role of secondary metabolites in defense mechanisms of plants;Mazid M;Biol Med,2011