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| Roets, F.; Oberlander, K.C.; Dreyer, L.L.. |
| South Africa has a rich, but scantily surveyed, desert flora. Documenting annual and geophytic species in this biome is challenging, as they usually only flower after adequate precipitation, which is characteristically erratic and infrequent. Recent floristic surveys in the Ai-Ais / Richtersveld Transfrontier Park were conducted after abnormally high precipitation and revealed the presence of numerous potentially new plant taxa, including two new members of the genus Oxalis. These taxa are clearly morphologically distinct from any known species. Here we explore the relationships of these species to other southern African species based on analyses of Internal Transcribed Spacer (ITS) and trnS-trnG DNA sequence data. Molecular data and morphological... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Oxalidaceae; Oxalis petricola; O. rubricallosa; Phylogeny; Taxonomy. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/525837 |
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| Roets, F.; Oberlander, K.C.; Dreyer, L.L.. |
| The genus Oxalis in southern Africa contains more than 200 species, with the vast bulk of species in the Greater Cape Floristic Region (GCFR). Recent fieldwork has suggested that many await discovery. Here we investigate the identity of two apparently undescribed Oxalis species from Northern Cape, South Africa, using morphological comparisons with closely related taxa. We provide a preliminary phylogenetic placement using DNA sequence-based analyses of the Internal Transcribed Spacer (ITS) region. Both putative new species are distinguished from all known Oxalis species based on macro-morphological traits. Molecular data placed both within a clade consisting of the weedy O. pes-caprae and its close relatives. Oxalis hirsutibulba sp. nov. is characterised by... |
| Tipo: Article / Letter to the editor |
Palavras-chave: New species; Oxalidaceae; Oxalis; Phylogeny; Taxonomy. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/525376 |
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| Dreyer, L.L.; Oberlander, K.C.; Roets, F.. |
| Southern African Oxalis taxonomy is complicated by tremendous morphological variation. The widely distributed Oxalis flava, for example, currently contains eight morphologically distinct forms. The remaining members of sect. Crassulae display morphological characters distinctive enough to retain specific status, despite resemblance to forms of the broadly defined O. flava. Recent collection of a taxon with strong morphological affinities to species in sect. Crassulae generated much interest. In this study we assess the placement of this new taxon to members of sect. Crassulae based on analyses of DNA sequence data of the Internal Transcribed Spacer (ITS) region and morphological comparisons. Results show that most members of sect. Crassulae are distantly... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Oxalidaceae; Oxalis fabaefolia; Oxalis flava; Phylogeny; Taxonomy. |
| Ano: 2010 |
URL: http://www.repository.naturalis.nl/record/526083 |
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