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Bulletin of Faculty of Science, Zagazig University (BFSZU))
Bulletin of Faculty of Science, Zagazig University (BFSZU))
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Abstract: |
leaf
architecture, a morphological character reported to be genetically fixed, is considered a significant
taxonomic tool in taxa identification and delimitation. Herein, eleven taxa namely, Abutilon hirtum, Hibiscus
× rosa- sinensis, Hibiscus sabdariffa, Hibiscus schizopetalus, Hibiscus syriacus, Hibiscus tiliaceus, Hibiscus
trionum, Malvaviscus arboreus, Sida alba, Dombeya burgessiae, and Dombeya tiliacea. were investigated
morphologically based on leaf architecture including (leaf blade macromorphological characters, major
veins orders, and minor veins orders) for each taxon to estimate the applicability of leaf architectural
features in the taxa identification and delimitation. A phenetic relationship between the taxa under
investigation based mainly on the major vein categories was constructed using UPGMA and PCA plotting
analysis. The resulting clustering dendrograms segregated the eleven studied taxa into two main clusters,
sharing a set of character states. The first one encompasses five taxa of tribe Hibisceae with a degree of
similarity to Malvaviscus arborous that represents tribe Malvavisceae. The second cluster encompasses Sida
alba, Abutilon hirtum, Dombeya burgessiae and Dombeya tiliacea, besides Hibiscus tiliaceus. The clustered
taxa per each cluster authenticate that there are shared lines between the different taxa not only at triable
level but also at sub-familial level. The resulted dendrogram emphasized the taxonomic significance of leaf
architectural characteristics in taxa identification, and delimitation at the species level that could be
harnessed in solving some taxonomic confusions for species substitutions at tribal level.
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