This study evaluated the effect of edaphic factors on species diversity and distribution of
vegetation in Wadi Sudr, Sinai Peninsula. The study included 21 stands, 54 species
belonging to 44 genera and representing 22 families, where the abundant family was Zygophyllaceae
comprising 15% of the total number of the recorded species. Chamaephytes were the dominant life
forms in the studied Wadi (55.56%). Chorological analysis showed the dominance of the monoregional
Saharo-Arabian chorotype (46.3%). TWINSPAN classification separated five vegetation groups which
included: (I) Zygophyllum album, (II) Haloxylon salicomicum, (III) Retama raetam, (IV) Reaumuria
hirtella and (V) R raetam. CCA analysis indicated that the vegetation group representing the
downstream of Wadi Sudr was affected by soil chemical properties, whereas CaC03% and physical
properties affected the vegetation groups representing the up and midstream parts of the Wadi.