Abstract
W adi Arar in the northern region of Saudi Arabia is one of the mostimportant Wadis of the Kingdom. The present study provides an analysisof vegetation types, life forms, as well as floristic categories and speciesdistribution. A total of 194 species representing 30 families of vascularplants were recorded. Compositae, Gramineae and Leguminosae were themost common recorded families. Therophytes and Chamaephytes are themost frequent life forms, indicating typical desert spectrum vegetation.The distribution of species in the different sectors of the Wadi as well asthe phytochoria for the recorded species is provided. Eighty nine species(45.88%) are typically bi-regional. Furthermore, about 105 species(53.5%) are mono- and pluriregional taxa. The highest number of species(135 or 69.59%) was recorded for annual plants, while the lowest numberof species (59 or 30.41%) was recorded for perennial, short perennial orannual to biennial species.
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