[01] Suliman Mohammed Alghanem, Biology Department, Science Collage, Tabuk University, Tabuk City, Saudi Arabia. [02] Hussein Qasim Al-Atwi, Biology Department, Science Collage, Tabuk University, Tabuk City, Saudi Arabia. [03] Mohammed Omar Al-Saiari, Biology Department, Science Collage, Tabuk University, Tabuk City, Saudi Arabia. [04] Abdul Karim Mohammed Al-Balawi, Biology Department, Science Collage, Tabuk University, Tabuk City, Saudi Arabia. [05] Saleh Ahmed Al-Zahrani, Biology Department, Science Collage, Tabuk University, Tabuk City, Saudi Arabia. [06] Ali Musa Al-Sayed, Biology Department, Science Collage, Tabuk University, Tabuk City, Saudi Arabia.

The present study was aimed to investigate the floristic diversity for Perennial species and phytogeographical distribution of plant species of Al-Wadi Al-akhder from Tabuk region, Saudi Arabia. A total of 30 species belonging to 23 genera and 15 families were recorded. Chenopodiacea had the highest contribution (20% of the total species) followed by Asteraceae and Fabaceae (16.76%), Lamiaceae (10%), Cistaceae and Asclepiedaceae (6.76%). The life form spectrum of the recorded species showed the prevalence of chamaephytes (56.67%) followed by Therophytes (20%), Phanerophytes (16.67%) and Hemicryptophyte (6.76%). The chorological analysis of the recorded species indicated the predominance of monoregional taxa over the other elements. In the same context, the flora of Tabuk region, as reflected by the present study findings, showed that most perennial species belonged to Saharo-Arabian (70%), Sudano-Zambezian and Mediterranean (26.67%) and Cosmopolitan (3.33%) elements, and that constitute almost 60% of the total number of plant species. It was concluded that Tabuk region had remarkable floristic diversity, however, this natural biodiversity hot spot is probably affected by several human activities including woodcutting and development. The associations and speciation of these Al-Wadi Al-akhder plants demonstrate significant variation in pH, electrical conductivity, soil mineral contents, and human impact. Therefore, a conservation program should be launched to protect the natural diversity in such important plant area.

Floristic Diversity, Tabuk, Suadi Arabia, Life Forms, Phytogeography

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