Twelve wadis proliferate in the area surveyed drain
this part of the Red Sea mountains into the Sea at
Qusseir province. Phytosociological study of these
wadis is based on the analysis of 55 stands using the
Zuarich-Montpellier technique. The vegetation survey
revealed the prevailance of perennials in this area.
Two distinct community types are recognized in the
stands studied in the investigated wadis, each of which seems to have its own ecological characteristics especially concerning the water factor. The community
type dominated by Capparis decidua and Tamarix
nilotica covering the deltaic areas and the end parts
of the wadis traversing the inland basement complex
country. Some members of this community type are
halophytic plants. The other community type dominated
by Pulicaria undulata and Pulicaria crispa was
found inhabiting most of the wadis courses especially
the high localities. Members of this community type
reflect the prevailing xerophytic conditions. Elements
of the alliance Zygophyllaeion coccini previously
recognized in other wadis of this desert are well
represented in these wadis. Within the area surveyed,
the individuals of most species covered in this study
exhibit a wide range of variation in size and vitality.These differences are related mainly to differences in water resources.