Abstract
One of the most countries containing which have biologically diverse, is Saudi Arabia. Among the plant species recorded in Saudi Arabia, about 30% are rare and around 18 plant species are thought to have been disappeared locally. The study aims to provide the researchers in various scientific fields with a list of wild plants available in the examined region. The current work focused on an analysis of life forms, life span and chorotypes in four fenced areas (Aoasa, Mayla, Goraba and Aqra) of wadi Ar'ar. A bout of 273 taxa belonging to 35 families and 169 genera of vascular plants were recorded. Phytogeographically, the listed species were classified into three groups; monoregional, biregional and pluriregional. Twenty four species were listed as cosmopolitan, paleotropical or pantropical. One important step in preserving our wild plants is to expand knowledge of vegetation and find solutions to preserve the environment and species from extinction.