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.

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.

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.

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.

Wadi Kharit is a major drainage system dissecting
the southern part of the eastern desert of Egypt
in an east-west orientation. Due to the volcanic
nature of the rocks it originates at, the eluviation
of soil along its course is distinguished into three
main recognizable soil types. Three plant communities
recognized in the wadi, apparently highly
related to its edaphic characteristics, are identified
for the first time in the eastern desert, The floristic composition of such communities are quite rich in both variety of species as well their abundance values. Little resemblance exists between such communities and other communities previously
identified in northern wadies of this desert, as
revealed frOm data obtained in previous studies in
this series as well as those of other investigators.

Wadi Kharit is a major drainage system dissecting
the southern part of the eastern desert of Egypt
in an east-west orientation. Due to the volcanic
nature of the rocks it originates at, the eluviation
of soil along its course is distinguished into three
main recognizable soil types. Three plant communities
recognized in the wadi, apparently highly
related to its edaphic characteristics, are identified
for the first time in the eastern desert, The floristic composition of such communities are quite rich in both variety of species as well their abundance values. Little resemblance exists between such communities and other communities previously
identified in northern wadies of this desert, as
revealed frOm data obtained in previous studies in
this series as well as those of other investigators.

Wadi Kharit is a major drainage system dissecting
the southern part of the eastern desert of Egypt
in an east-west orientation. Due to the volcanic
nature of the rocks it originates at, the eluviation
of soil along its course is distinguished into three
main recognizable soil types. Three plant communities
recognized in the wadi, apparently highly
related to its edaphic characteristics, are identified
for the first time in the eastern desert, The floristic composition of such communities are quite rich in both variety of species as well their abundance values. Little resemblance exists between such communities and other communities previously
identified in northern wadies of this desert, as
revealed frOm data obtained in previous studies in
this series as well as those of other investigators.

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.

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.

A polymeric chelate based on salicylidene-o-aminophenol (SAP) chelating with zinc (Zn(II)) ion was studied by several spectroscopic techniques. A simple, rapid and sensitive method for the spectrophotometric determination of trace amounts of Zn(II) ion in solution by chelating with SAP is proposed. This method has been applied successfully to the determination of Zn(II) ion in Immu-C sachets samples (mg/g). The proposed method is in excellent agreement with the determination of Zn(II) ion by atomic absorption spectrometry.