Wadi Quena is one of the major wadis of the Eastern
Desert in Egypt. It is unique in its nourth-south orientation
among other wadis in this desert. Phytosociological
study of this wadi is based on the analysis of
vegetation in 21 stands, using the Ziirich Montpellier
technique. The vegetation survey indicated the prevailance
of perennials in this wadi. Thirty nine species
comprising the vegetation of the wadi are segregated in
two community types: I. Anabasis setifera - Acacia
ehrenbergiana and 2. Zygophyllum coccineum-Shouwia
thebaica. The second community type has two subcommunities:
a. Tamarix nilotica '- Artemisia judaica and
b. Cotula cinerea - Cleome droserifolia. Elements of
the alliance Zygophyllaeion coccini previously recognized
in other wadis of this desert are well represented in
this wadi. The distribution of the communities recognized
in this study seems to be dependent upon the moisture
retention properties and on the soil depth.