Department of Botany and Zoology
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Browsing Department of Botany and Zoology by Author "Abun Woldetinsae, Azieb"
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- ItemA palynological study of selected American members of Oxalis L.(Stellenbosch : Stellenbosch University, 2003-12) Abun Woldetinsae, Azieb; Dreyer, L. L.; Marais, E. M.; Stellenbosch University. Faculty of Science. Dept. of Botany and Zoology.ENGLISH ABSTRACT: Oxalis L. has two centres of diversity, one in South-Central America and the other in southern Africa. Previous palynological studies of southern Africa Oxalis revealed four main pollen types, namely rugulate-reticulate, micro-rugulate-spinate, reticulate and supra-areolate (Dreyer 1996). The reticulate pollen type is further divided into 15 subtypes, out of which five have a monotypic status. The supra-areolate pollen type is divided into four subtypes based on exine structure. The reticulate pollen type is the most common pollen type within the South African members of Oxalis. The three remaining main pollen types display more complex exine structures and are therefore considered more derived than the reticulate pollen type. The present study assessed the pollen of 50 American Oxalis species with three main objectives: 1. To observe pollen type variations among American members of Oxalis, 2. To compare pollen types from the two centres of diversity, and 3. To assess which centre of diversity house the palynologically more advanced species of Oxalis. Two main pollen types are recorded from the present study, namely reticulate and verrucate pollen types. The reticulate pollen type could be further divided into 11 subtypes. Out of the 11 subtypes observed, nine also occur among South African members of Oxalis, while two types are only observed in the American members of Oxalis. The verrucate pollen type is found in a single American taxon and displays a more complex exine structure than the reticulate pollen type. In this study the reticulate pollen type proved to be the most common pollen type among the American members of Oxalis. The South African members of Oxalis display more complex pollen types than the American members of the genus.