The ldfu-Marsa Alam road crosses through six wadis
in the Eastern Desert in upper Egypt. Three, namely
wadi Abbadi, Wadi Kanayis and wadi Barramiya drain
their water in the Nile Valley, while the other three,
wadi Beizah, wadi Duber and wadi Abu Qaraiya drain
their water in the Red Sea. The phytosociological study
of these six wadis along the road was based on the analysis
of vegetation in 20 stands using the Ziirich-
Montpellier technique. The vegetation survey indicated
the prevalance of perennials. The phytosociological
tableau revealed four community types in the wadis,
one of which seemed to be a segetal part of an "AIliance" wide-spread in other wadis of this desert. These communities are:
I. Zilla spinosa - Aerva javanica,
2. Pulicaria undulata-Schouwia thebaica,
3. Cleome arabica-Crotalaria aegyptiaca
4. Acacia tortilis-Zygophyllum coccinewn.