Cairo University Herbarium (CAI)Taeckholmia1110-741341120210301Impact of the invasive species Vossia cuspidata (Roxb.) Griff. on the diversity and temporal changes of the native flora of the River Nile in Egypt11715321710.21608/taec.2021.62873.1029ENEmad A.FarahatHelwan UniversityWaleed F.MahmoudBotany and Microbiology Department, Cairo University, EgyptGamal M.FahmyFaculty of Science, Cairo UniversityHussein F.FarragBotany and Microbiology Department, Cairo University, EgyptHossam E.AwadBotany and Microbiology Department, Cairo University, EgyptJournal Article20210213Invasive plant species are major drivers of biodiversity losses, particularly on islands that are vulnerable to invasions and extinction. The objective of this study was to document the vegetation structure and changes over time in two Nile Islands due to invasion by Vossia cuspidata (Hippo grass). One-hundred and one stands were assigned in three sites along the River Nile in Cairo, Egypt. Fifty-one associated species were recorded, belonging to 28 families. Annuals (Thereophytes) were the main life form in the area (51%) followed by helophytes (29%). Twelve vegetation groups were identified, representing the main communities in the studied stands. V. cuspidata was the dominant species and its maximum cover was recorded during the summer season. The lowest values for species diversity were recorded in open water, while the highest values were recorded in water edges and slopes of the riverbanks. There was up to 70% reduction in the cover of native species in the study area due to the invasion by V. cuspidata. Many native species were either disappeared or poorly recorded in the studied sites. Stem height and the cover of V. cuspidata in aquatic and riparian habitats lead to severe negative impacts on the growth and the diversity of native flora in the River Nile. Consequently, conservation of native flora through removing the invasive species should be a future priority along the River ecosystem.https://taec.journals.ekb.eg/article_153217_acb874d9b4a0026fb797ec069912acf4.pdfCairo University Herbarium (CAI)Taeckholmia1110-741341120210813Phenotypic Diversity of Eragrostis Wolf in Egypt183118904510.21608/taec.2021.88939.1033ENSami HusseinRabeiBotany and microbiology Department,
Faculty of Science,
Damietta University,
New Damietta , Post Box 34517
Damietta, Egypt.0000-0001-6042-5877HasnaaHosniFaculty of Science,Cairo University0000-0001-7609-9383Ashraf T.SolimanDepartment of Botany and Microbiology, Faculty of Science, Cairo UniversityJournal Article20210702Eragrostis Wolf is considered one of the largest genera of family Gramineae (Poaceae). It is a cosmopolitan genus and represented in Egypt by 14 taxa. The species limits are often overlapping due to the wide range in variation within this genus. So, it is difficult to establish specific boundaries and diagnostic characters. The main goal of this work is to establish the limits and the diagnostic characters in the Egyptian taxa, using cluster analysis and principal coordinates analysis based on morphological characters. Interactive keys have been designed as an aid for online identification and looking for diagnostic characters. The morphological characters of Inflorescence, spikelets, panicle, glumes, palea keels and caryopsis are very important and necessary in the identification of the studied species. The results of coordinate analysis as well as UPGMA dendogram revealed that Egyptian Eragrostis species can be divided into 3 groups: group (A) includes: E. minor and E. cilianensis; group (B) includes E. tef, E. tenuifolia, E. sarmentosa, E. barrelieri, E. aegyptiaca and E. pilosa while group (C) includes E. aspera, E. ciliaris, E. japonica, E. lepida, E. tenella, and E. tremula. More research is needed to confirm the occurrence of several taxa in Egypt, such as Eragrostis purpurascens and E. nitida, which have been reported in some publications but are uncertain.https://taec.journals.ekb.eg/article_189045_18db0c47756ad0a936d502e9da322623.pdfCairo University Herbarium (CAI)Taeckholmia1110-741341120210301Floristic study of Saint Katherine protectorate, Sinai: with one new record to flora of Egypt325519077710.21608/taec.2021.190777ENSamiRabeiBotany and Microbiology Department,
Faculty of Science,
Damietta University,
New Damietta , Post Box 34517
Damietta, Egypt.
Tel. Mobile: 002 0101 7895350
Tel. Work: 002 057 2403981
Tel. Home: 002 057 2403108
Fax: 002 057 24038680000-0001-6042-5877AbdelhamidKhedrBotany and Microbiology Department, Faculty of Science, Damietta University, New Damietta, Damietta, Egypt.Ibrahim AElgamalSaint Katherine Protectorate, Egyptian Environmental Affairs Agency (EEAA), EgyptJournal Article20210613Saint Katherine protectorate is one of the most floristically diverse spots in the Middle East. A field surveys, as well as critical revision of herbarium specimens, were carried out during 2013-2020 revealed that 430 taxa belonging to 283 genera and 62 families. The life-forms are classified into seven life forms with dominance of Therophytes (39%) followed by Chamaephyte (24.7%). Chorological study indicated that 52% of recorded taxa were mono-regional native to Saharo – Arabian (29%), Irano- Turanian (10.39%), Mediterranean (7.4%), Sudanin (4%) while tropical and sub- tropical represented by (0.2%) only. 223 taxa were mono-regional, 127 taxa were bi-regional, while 16 taxa were endemic and Steno-endemic. Investigated taxa distributed in four microhabitats; terraces, slopes, gorges, and wadi bed the last two were the most diversity. The present study investigated that presence of Papaver somniferum is a new record to flora of Egypt, eight new records to Sinai and thirty four new records to the study area.https://taec.journals.ekb.eg/article_190777_60f6000eaf6275ab31a7f0d8fafd3d0c.pdfCairo University Herbarium (CAI)Taeckholmia1110-741341120220411Taxonomic revision of genus Oxalis L. (Oxalidaceae) in the flora of Egypt566922998210.21608/taec.2022.118726.1036ENEman MahmoudShamsoPlant & Microbiology Department, Faculty of Science, Cairo University, Giza 12613, Egypt0000-0002-0068-0224AmalDrazPhytochemistry & Plant Systematics Department, National Research Centre.Hasnaa AhmedHosniFaculty of Science,Cairo University0000-0001-7609-9383Sameh RedaHusseinPhytochemistry & Plant Systematics Department, National Research Centre.Journal Article20220128This paper provides a full taxonomic revision of the genus Oxalis for the flora of Egypt. The study was carried out on herbarium specimens as well as fresh materials. The study revealed the presence of five species and one variety belonging to three sections by adding O. corymbosa and O. latifolia. Oxalis corniculata is a polymorphic taxon in Egypt which led to the recognition of O. corniculata L. with its type var. corniculata and O. corniculata L. var. repens (Thunb.) Zucc. The species are mostly weed of cultivation along Mediterranean and Nile Valley with the exception of O. anthelmintica which is restricted to southeastern corner of Egypt. Among the studied taxa, variation in the presence or absence of stem, bulb characters, leaflets shape and color of flowers were found significant diagnostic characters for delimiting the taxa. For each taxon, update nomenclature, synonyms, type, amended descriptions, distribution (local and global), representative specimens are given. Photographs and diagnostic key to the species are provided to assist in identification.https://taec.journals.ekb.eg/article_229982_30303425bd2f4120e98d4356479e28bc.pdfCairo University Herbarium (CAI)Taeckholmia1110-741341120220608Chromosomes as Sources of Taxonomic Information for Plant Systematics and Evolution709024286610.21608/taec.2022.138485.1038ENAbdelfattahBadrFaculty of Science, Helwan University0000-0002-3327-8151Journal Article20220516Chromosomes are the units of inheritance within the nuclei of all eukaryote cells and carry the genes as DNA packaged in the chromosomes forming the chromatin fibril with histone proteins. The DNA content of each chromosome is a single linear DNA double helix, which corresponds genetically to a linkage group. The chromosomes are only seen during cell division because of coiling up as chromatin in the non-dividing nucleus. In somatic cells, chromosomes occur as pairs of homologous chromosomes or homologs. During cell division, the chromosomes, condense into individual chromosomes during the stages of division (prophase, metaphase, anaphase, and telophase). The chromosomes are best studied at metaphase in somatic cells as each chromosome appears as two longitudinal chromatids. Each chromosome is composed of two arms separated by the centromere and terminated at the ends by telomeres. One member of each homologous chromosome is inherited from either the male or female plants, these homologs pair as bivalents in the first meiotic prophase. In about 45% of plants, more than two sets of chromosomes have been reported, these are known as polyploid numbers. The chromosome features that have been used as sources of taxonomic information include various attributes of chromosomes; the most common features are: 1) chromosome number, 2) chromosome size and gross morphology, 3) chromosomal variations in number and shape, 4) chromosome’s behavior at meiosis, 5) chromosome banding as revealed by differential staining of some chromosome parts and 6) in situ hybridization and chromosome painting to locate genes on chromosomes. A special role is claimed for chromosomal data in taxonomy since chromosomes are the seats of genetic information that guides plant species evolution. The recent molecular cytogenetics approaches are producing a wealth of new data of enormous taxonomic and evolutionary importance, that must be fully integrated with traditional taxonomic data. In this article, the taxonomic attributes of chromosomes are described and examples of their role of chromosomes in flowering plant systematics and evolution are outlinedhttps://taec.journals.ekb.eg/article_242866_6bdb6ac06221e03c39e1bc7cd386c600.pdf