'n Taksonomiese studie van die genus Anginon Raf. (Apiaceae)
- Authors: Allison, Izelle
- Date: 2014-04-23
- Subjects: Umbelliferae - South Africa
- Type: Thesis
- Identifier: uj:10807 , http://hdl.handle.net/10210/10314
- Description: M.Sc. (Botany) , Morphological, anatomical, palynological, cytological, phenological and geographical evidence are used to investigate relationships between the species of Anginon. These characters are discussed and illustrated. Characters of' the genus Glia Sond. were also studied and the genus is shown to be an obvious outgroup in a phylogenetic analysis. Despite the paucity of characters and the variability of character states in the genus Anginon, it is possible to give here a summary of character evolution as interpreted within the genus and also an explicit hypothesis (cladogram) of phylogenetic relationships amongst the species. Especially, the study of the fruit anatomy has resulted in a better understanding of taxonomic relationships at the generic and infrageneric levels. A formal taxonomic treatment is presented, including a key to the species, correct nomenclature, typification, descriptions and distribution maps.
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A taxonomic study of the genus Lessertia DC. (Fabaceae, Galegeae)
- Authors: Nkonki, Tandiwe
- Date: 2013-09-11
- Subjects: Galega - Morphology , Galega - South Africa , Legumes - South Africa , Medicinal plants - South Africa , Lessertia DC.
- Type: Thesis
- Identifier: uj:7726 , http://hdl.handle.net/10210/8596
- Description: M.Sc. (Botany) , The genus Lessertia DC. consists of 54 species of papilionoid legumes. The species have imparipinnate leaves, paired stipules, sub-capitate or elongate racemes and compressed or inflated legumes. The closest relative of the genus is Sutherlandia R. Br. ex W. T.Aiton, which differs in having a very large, bird-pollinated flower, a standard which is smaller than the keel, a long ovary stipe and a very large, much inflated legume. The last comprehensive revision of Lessertia was done by Harvey (1862), where 30 species were recognized. Harvey concluded that the species were difficult to define. This study was therefore initiated to evaluate characters of possible taxonomic value so that the circumscription and identification of species can be facilitated. More than 1000 specimens from different herbaria were examined to study morphological characters such as habit, indumentum, leaves and leaflets, flowers and flowering times, fruits, habitat and distribution of the species. Flowers of all the species were dissected and flower parts were drawn using camera lucida. Flower characters such as the length, width and vestiture of the petals were studied. For flavonoids and terpenoids, 17 species of Lessertia were sampled for a pilot study to compare chemical compounds between the species. The ethnobotanical literature was reviewed in order to compile a list of all the species of value in traditional medicine. Vegetative characters are often not species-specific but they can be used to distinguish between some closely related species, either as single characters or as combinations of characters. Further details can be seen in the keys presented in this study.
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Chemosystematic studies of selected South African members of the family Apiaceae (Umbelliferae)
- Authors: Sobiyi, Oluwakemi Kehinde
- Date: 2017
- Subjects: Umbelliferae - Anatomy , Umbelliferae - Classification
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/244121 , uj:25243
- Description: M.Sc. (Botany) , Abstract: There is a huge gap in the information of the chemistry of African Apiaceae. Little is known about the chemosystematic pattern at the tribal, generic and species level. In contrast, recent anatomical and molecular studies have given new insights into relationships and a new classification system has been proposed. This molecular phylogeny gives the opportunity to compare the chemical patterns against the anatomical and molecular results. In this study, nine genera and a representative number of species were evaluated to identify their chemical constituents. There was also further comparison between species of the same genus and within tribes to ascertain similarities between sister groups. A thorough literature review of the chemistry of African Apiaceae was done to provide a first overall assessment of the potential for chemosystematics studies in the African members of the family, which has a centre of diversity in southern Africa. Highlights of the discoveries made during this study include the identification of limonene as main volatile compound in the roots of Cynorhiza typica. The dried roots of the plant is an important traditional Khoi-San source of yeast, used in preparing traditional mead (honey beer, known as karri). The presence of limonene would have added a citrus (orange or lemon) flavour to the mead. Likewise, the chemical basis for the anise smell and taste of the roots of Annesorhiza nuda (anise root, a traditional food item of the Cape Khoi and Dutch settlers) was also revealed for the first time by the identification of estragole (with trace amounts of anethole) in the roots. Of special...
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