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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Taxonomic studies and generic delimitation in the grass subtribe Sorghinae

Setshogo, Moffat Pinkie January 1997 (has links)
Genera and species of the grass subtribe <I>Sorghinae </I>were investigated. This study covered taxa from the whole range of their morphological variation and geographic distribution. In order to make the study feasible in the time permitted, a representative sample was chosen. Parameters used in choosing this sample are outlined in Chapter 1. The objective of the study was to determine and ascertain generic boundaries in the subtribe and hence reveal relationships between them. Fourteen genera are recognised in the subtribe. These are <I>Asthenochloa, Bothriochloa, Capillipedium, Chrysopogon, Cleistachne, Dichanthium, Euclasta, Hemisorghum, Pseudodichanthium, Pseudosorghum, Sorgahstrum, Sorghum, Spathia </I>and <I>Vetiveria. </I>They were confirmed to form clearly distinct genera despite suggestions by some authors to the contrary, some of whom have advocated merging some genera in the subtribe. The genera divide into two groups. The first group consists of <I>Sorghum </I>and allies, while the second group is centred around <I>Dichanthium </I>(Chapter 3). Numeric analyses were used to highlight both phenetic and phylogenetic relationships between the genera (Chapter 7). The phenetic analysis broadly revealed a somewhat similar picture to the one I held. Species of the same genus cluster in the same place. Also those genera that are least similar separate at low phenon levels. The cladogram produced, however, was totally different from my intuitive classification of the subtribe. Formal taxonomic descriptions incorporating keys and specimens seen can be found in Chapter 8. A new combination in <I>Euclasta, E. oligantha </I>(Hotchst. ex. Steud). M.P. Setshogo, was recognised (Appendix 11.2). Several sources of evidence were used in the research. These were the use of micro- and macro- morphology and anatomy. The research was based on the use of herbarium material as well as living plants.

Studies on modern pollen spectra

Printice, I. C. January 1977 (has links)
No description available.

Studies in the genus Rosa

Lata, P. January 1980 (has links)
No description available.

An experimental taxonomic study of some species of carex with special reference to the C. flava aggregate

Davies, Elizabeth W. January 1953 (has links)
No description available.

Two species of Gloiopeltis from Hong Kong

Chiu, Bek-To January 1967 (has links)
No description available.

Taxonomy, Structure and Reproduction of Some Members of the Rhodymeniales Sensu Kylin

Guiry, M. D. R. January 1976 (has links)
No description available.

Taxonomic studies in the umbelliferae sub-tribe apiinae

Khan, H. U. January 1980 (has links)
No description available.

Incongruence in taxonomic data of the cytisus-genista complex

Harris, J. A. January 1980 (has links)
No description available.

Experimental studies on the establishment and stability of ectomycorrhizas

Giltrap, N. J. January 1980 (has links)
No description available.

Molecular phylogenetics of tribe Epidendreae with emphasis on subtribe Laeliinae (Orchidaceae)

Van Den Berg, Cassio January 2000 (has links)
No description available.

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