Wadi Quena, unique in its north-south orientation
among other wadies of the eastern desert of Egypt
constitutes a vast catchment system of sporadic rains
over the Red Sea mountains. The present study concerns
a part of this catchment area, including some eastwest
tributaries pouring flood waters into the lower
part of the main trunk of the wadi. Due to local
physiographic factors, these tributaries harbour two
communities newly recognized in this desert. These are:
community of Salsola haryosma-Tamarix aphylla and
community of Cilrullus colocynlhis-Cleome droserifolia.
Elements of the alliance Zygophyllaeion coccini, previously
identified in this series of investigations, are well
represented in the area under consideration.