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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/14769
Title: A Palynological-Taxonomic Study of the Genus Asystasia and a Palynological Study of Some Related Genera in the Acanthaceae
???metadata.dc.contributor.*???: Mrs. Sue Edwards
Kelbessa, Ensermu
Issue Date: Jun-1982
Publisher: Addis Ababa University
Abstract: The pollen morphology of nineteen species of Anthracite: nine of Asystasa. and ten of five other genera have been investigated using light and/or electron microscopes The five genera Graptophyllum, Jacobi Nia, Justinian, McKay and Stygian can be separated from each other by the number and character of apertures, exine stratification and/or by the nature of the trema area". The study has revealed that the pollen grains of the genus Asystasia are three-porate and the surfaces are pro┬Čvided with nine colpoid streaks. The sexine is smooth. The species can be separated from each other by the difference in the prominence of the colpoid streaks and by the nature of the sexi-nuous region around the pore a detailed study of the pan-tropical species A. gangetica (L.) T, Anders, has resulted in its subdivision into two geo-graphical subspecies on the basis of corolla and style and stigma lengths. It is also supported by pollen size and seed morphology. The subspecies with long corolla and style and stigma is designated as subsp. gangetica and the one with short corolla and style and v Stigma subsp, micrantha. The distribution of both taxa is illustrated.
Description: A Thesis Submitted to School of Graduate Studies Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Biology
URI: http://hdl.handle.net/123456789/14769
Appears in Collections:Thesis - Biology

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