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Systematic significance of bulb morphology of the Southern African members of Oxalis L. (Oxalidaceae)

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dc.contributor.advisor Dreyer LL, Dr en
dc.contributor.advisor Marais EM, Dr en
dc.contributor.author Gebregziabher AK en
dc.date.accessioned 2016-09-22T08:34:37Z
dc.date.available 2016-09-22T08:34:37Z
dc.date.submitted 2004 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/31154
dc.description.abstract The systematics of the southern African members of the genus "Oxalis" L. (Oxalidaceae) is in a state of "flux". The bulbs of these species contain potential taxonomically important characters and therefore require detailed study (Salter, 1944). A pilot study assessed the homology of bulbs among southern African "Oxalis" species (Gebregziabher, 2001), and found that they are all homologous structures. This pilot study also emphasized the range of potentially informative characters from different bulb parts. The aim of the present study was to assess the taxonomic significance of bulb morphology in selected southern African "Oxalis" species. As far as possible, efforts were made to represent both the taxonomic (Salter, 1944) and palynological diversity (Dreyer, 1996) present in the genus. Detailed bulb morphological studies of 30 species of southern African "Oxalis" species revealed 41 potentially informative characters. Different bulb-types were identified based on these characters. Bulb-type affinities of taxa included in this study, as well as bulb descriptions from the pilot study (Gebregziabher, 2001), were discussed. Comparison with the current taxonomic classification (Salter, 1944), palynological classification (Dreyer, 1996) and a preliminary phylogeny based on the non-coding plastid "trnL-trnF" DNA region (Oberlander, 2003), were also made. Bulb morphology conflicted with the current taxonomic classification (Salter, 1944), but showed greater congruence with both the palynological groupings and the "trnL-trnF" based phylogeny. Based on this study, bulb morphology is found to be taxonomically significant. Further studies on the bulb morphology and anatomy of southern African "Oxalis" species are merited. en
dc.language English en
dc.title Systematic significance of bulb morphology of the Southern African members of Oxalis L. (Oxalidaceae) en
dc.type Masters degree en
dc.description.degree MSc en

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