Five wadis proliferate in the area surveyed (latitudes 27°-28 N and longitudes 33°-34 E) drain this part of the Red Sea mountains into the sea (lower Gulf of Suez)./This wadi system have distinguished variation in geomorphological and edaphic characteristicS. ACcordingly four associations phytosociologically identified are reflections of such variations. Such associations are not repetitions to those identified before in this series of investigations. Also, they have no analogues among communities recognized in this desert by other investigators.