Abstract
The Floristic composition, life forms and phytogeographical iaffinities were conducted in Al-Hashr Mountain, Southwestern iSaudi Arabia. In total, 116 plant species belonging to 95 genera iand 47 families were collected and identified. Asteraceae and iPoaceae were the most important families in terms of species irichness. The life forms spectrum was dominated by ichamaephytes, while the remainders were therophytes and iphanerophytes, denoting phytoclimate of semi-arid mountainous ihabitat with topographical variation refuge many microhabitats, as iwell as anthropogenic factors. Due to its location, the study area, ias a part of southwestern Saudi Arabia, is a meeting place of isome phytogeographical regions of Holarctic and Palaeotropic, iwith high affinity to Sudano-Zambezian phytochorion, as well as ihigh degree of endemism of South Arabian. i
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