Cairo University Herbarium (CAI)Taeckholmia1110-741320120001201Studies on the Vegetation and Soil Seed Bank in Western Saudi Arabia. 2. East of Jeddah1151247310.21608/taec.2000.12473ENKamalZayedBotany Department, Faculty of Science,
Cairo University, Giza 12613, Egypt.ZeinabEl KaremyBotany Department, Faculty of Science,
Assiut University, Assiut, Egypt.Journal Article19991220Seed bank dynamics and vegetation analysis were undertaken in the eastern outskirts of Jeddah town. Seven<br />plant communities are recorded namely Lasiurus scindicus, Calotropis procera, Blyttia fruticulosum, Cappparis<br />decidua, Panicum turgidum, Suaeda monoica-Tamarix aphylla and Zygophyllum simplex community. Eighty<br />eight species of vascular plants are recorded.<br />The study included also the evaluation of seed buried in the soil (seed bank). Relations between<br />communities and their habitat types as well as the seed bank dynamics in the area are briefly discussed.Cairo University Herbarium (CAI)Taeckholmia1110-741320120001201Tamaricaceae in the flora of Egypt.17311247410.21608/taec.2000.12474ENHasnaaHosniThe Herbarium, Faculty of Science,
Cairo University, Giza – 12613, Egypt.Journal Article19990917A taxonomic revision of the family Tamaricaceae in Egypt is presented. Twelve species belonging to two genera<br />are reported among which Tamarix chinensis Lour. is a cultivated species.<br />Key to the genera, sections and species based on macroscopical and microscopical characters is<br />given. Representative specimens as well as geographical distribution and habitat for each species are also<br />provided. Tamarix nilotica var. arabica (Bunge) H. Hosni is a new combination while Tamarix arborea (Sieb.<br />ex Ehrenb.) Bunge and T. mannifera (Ehrenb.) Bunge are treated as distinct species.Cairo University Herbarium (CAI)Taeckholmia1110-741320120001201The morphology and anatomy of the achene in certain species of sub-family Ranunculoideae (Ranunculaceae) with special reference to the achene vasculature33491247510.21608/taec.2000.12475ENMagdyMouradBotany department, faculty of Science
Ain Shams University, Cairo - EgyptKarimaHamedBotany department, Faculty of Science Ain Shams University, Cairo – EgyptAbd El-SalamAl- NowaihiBotany Department, Faculty of Science,
Ain Shams University, Cairo-Egypt.Journal Article19990122The achene in 17 species of the sub-family Ranunculoideae (Ranunculaceae) was morphologically and<br />anatomically studied to show the variation patterns of these two parameters. The surface of the achene and the<br />appearance of the style whether normal and plumose or in the form of a beak were found to be delimitrate to the<br />taxa studied. SEM investigation of the pericarp showed that six types of surface sculpture were recorded and the<br />reticulate type was sub-divided into six sub-types. Stress was laid upon the achene vasculature for suggesting a<br />phylogenetic status for the studied taxa. It was concluded that less advanced taxa are those having increased<br />number of vascular bundles (8-12 bundles). Intermediate taxa are those with three vascular bundles; one dorsal<br />and two distinct ventral bundles. More advanced taxa are those with one dorsal and two fused ventral bundles.Cairo University Herbarium (CAI)Taeckholmia1110-741320120001201Flowering and Fruiting Eco-physiology of Calotropis procera (Ait.) W.T. Ait., and importance of Gas in Fruit dehiscence.69801247610.21608/taec.2000.12476ENHasanEl-TantawyBotany Department, Faculty of Sicence, Menoufia University
Shebin El-Kom, EgyptJournal Article20000112The phenology and ecology of flowers, fruits and mechanism of fruit dehiscence have been studied.<br />Usher Calotropis procera produces flowers throughout the year with a peak in the early dry season<br />(summer). The number of flowers was very high reaching of 959 flowers/tree, while the production of fruits was<br />very low (22 fruit/tree). Each seed is covered at one tapered end by parachute-like silky hairs of about 3.16 ±0.4<br />cm. in length. It is possible to use the seed hairs as source for natural fibers in arid and semiarid regions. Fruits<br />are dehiscent by gas pressure (140.75±24.4 mm Hg). It was found that the gas occupies about 70% of whole<br />volume of fruit. The gas content (N2 & O2) expands with increased temperature causing a pressure on the<br />pericarp and leading to fruit dehiscence.Cairo University Herbarium (CAI)Taeckholmia1110-741320120001201Response of Vegetation and Soil Seed Bank to Habitat Diversity in Riyadh desert, Central Saudi Arabia81941247710.21608/taec.2000.12477ENKamalZayedBotany Departmen, Faculty of Science,
Cairo University, Giza, Egypt.Journal Article20000327Four ecologically different habitats within Riyadh desert (Central Saudi Arabia) were studied. Three different<br />plant communities dominated by Pulicaria crispa, Lycium shawii and Farsetia aegyptia form the vegetation<br />units inhabiting the first habitat represented by depressions and wadi terraces with deep and finely textured soil.<br />The seed content in the upper 2 cm of these soils ranged between 38304 and 71484 seeds/m2. The second habitat<br />is represented by the runnels dissecting gravelly areas with shallow and coarse-textured soil. This habitat<br />supported the growth of two plant communities dominated by perennial grassland species Cenchrus ciliaris and<br />Lasiurus scindicus with soil seed content amounting to 14855 and 9000 seeds/m2 in the two communities<br />respectively. Sandy plains represent the third investigated habitat which is inhabited by Rhazya stricta<br />community with soil seed content amounting to 41580 seeds/m2. Saline soils supporting growth of the<br />communities dominated by salt tolerant species Tamarix nilotica and Zygophyllum album formed the fourth<br />investigated habitat. The counted seeds in the upper 2 cm of the soil were 53352 and 15624 seeds/m2 in the<br />above communities, respectively. The present study showed that the emerged seedlings from the soils collected<br />from the recognized communities represented a low value ranged from 0.92 to 3.38% out of the total estimated<br />seed bank.Cairo University Herbarium (CAI)Taeckholmia1110-741320120001201SEM of seed coat surface and SDS-PAGE of seed protein criteria in certain taxa of the Primulaceae951111247810.21608/taec.2000.12478ENAbed-El-MoniemAboel-AttaBiological Sciences and Geology Department, Faculty of Education,
Ain Shams University, Roxy (Heliopolis), P.C.11341, Cairo, Egypt.MagedAbou-El-EnainBiological Sciences and Geology Department, Faculty of Education,
Ain Shams University, Roxy (Heliopolis), P.C.11341, Cairo, Egypt.0000-0002-8695-925MohamedLoutfyBiological Sciences and Geology Department, Faculty of Education,
Ain Shams University, Roxy (Heliopolis), P.C.11341, Cairo, Egypt.Journal Article20000218SEM of seed coat surface and SDS-PAGE of seed protein criteria were used to re-assess the taxonomic<br />relationships between 12 species belonging to three genera of Primulaceae, viz. Cyclamen L. (one species),<br />Lysimachia L. (six species) and Primula L. (five species). The data obtained, in addition to other characters<br />available in the literature, were analyzed by the NTSYS-pc. Program package using the UPGMA clustering<br />method. A considerable divergence was evident between Cyclamen and each of Lysimachia and Primula. A<br />close relationship was recorded between each of Lysimachia lichiangensis Thunb. & L. verticillata Bieb; L.<br />ephemerum (Gray) Hbd.& L. punctata L.; Primula burmanica Fern.& P. japonica Gray; Primula elatior (L.)<br />Hill & P. veris L. The variations in SDS-PAGE of seed protein profiles were compatible to some extent with the<br />morphological variations exhibited in these taxa. The validity of using the seed coat microsculpture and seed<br />protein electrophoretic criteria as taxonomic evidence in the Primulaceae was referred to.Cairo University Herbarium (CAI)Taeckholmia1110-741320120001201Bryophytes of the United Arab Emirates (UAE)1131141247910.21608/taec.2000.12479ENWagiehEl- SaadawiBotany Department, Faculty of Science,
Ain Shams University, Cairo, Egypt.HanaaShabbaraBotany Department, Faculty of Science,
Ain Shams University.
Cairo-Egypt.Journal Article20000516Interest in bryophytes of the United Arab Emirates (UAE) is relatively quite<br />recent and, hitherto, only four works (Long, 1987; Frey & Kürschner, 1988; Kürschner &<br />Böer, 1999; Shabbara & El-Saadawi, 1999) pertaining to the bryoflora of that part of the<br />Arabian Peninsula (Fig. 1) have appeared.<br />Only one hepatic was reported in the work of Long (1987) while in the work of<br />Frey & Kürschner (1988) a second hepatic and three mosses have been reported. In 1999<br />Kürschner & Böer added five hepatics and 12 mosses which raised the total number of<br />bryophytes known from UAE to 22 taxa (seven hepatics and 15 mosses). Shabbara and<br />El-Saadawi (1999), further added one new hepatic and 24 new mosses; however five of<br />these mosses were among those reported by Kürschner and Böer in the same year. This<br />makes the total now known from UAE as 42 taxa (eight hepatics and 34 mosses).<br />This represents a relatively good contribution to the bryoflora of that area of the<br />Arabian Peninsula which was, till quite recently, almost unknown bryofloristically.<br />Names of all the reported taxa and details about their distribution and floristic<br />relationships will soon be published