Thesis (M.Sc. ) -- University of Adelaide, Dept. of Genetics, 1970.

Akademisk afhandling--Upsala.

Thesis (MSc)--University of Stellenbosch, 2005. / Bibliography. Also available via the Internet.

Thesis (MSc)--Stellenbosch University, 2003. / ENGLISH ABSTRACT: The phylogenetic relationships and taxonomic status of South African Oxalis L. species are highly unresolved, both regionally and with regard to precise placement within the genus as a whole. Studies based exclusively on morphological and palynological characteristics have hitherto proved only partially successful in resolving natural groupings among the indigenous taxa of the region. Recent studies involving a few native taxa have indicated the plastid trnL-trnF non-coding DNA region as useful for the purposes of reconstructing phylogenetic relationships within the genus. The present study addressed the taxonomic monophyly and relationships of the highly unresolved section Angustatae subsection Lineares, using DNA sequence data. The phylogenetic reconstruction of southern African Oxalis species renders five of the subsections of section Angustatae sensu Salter (1944) polyphyletic, three of them conclusively so. The members of subsection Lineares are split between three clades, two of them with strong bootstrap support. None of these three clades consists exclusively of species of subsection Lineares. Likewise four of the seven assemblages of related taxa within subsection Lineares sensu Salter (1944) are not retrieved as monophyletic. Pollen data sensu Dreyer (1996) supports the clades retrieved in this study, whereas very few morphological characters could be plotted as potential synapomorphies for these clades. The resultant phylogenetic reconstruction thus supports palynological data of this subsection, and indicates the urgent need for a revision of the current morphological classification of Salter (1944). / AFRIKAANSE OPSOMMING: Die filogenetiese verwantskappe en taksonomiese klassifikasie van Suid Afrikaanse Oxalis L. spesies is nog baie onduidelik, beide binne die gebied en ten opsigte van die presiese plasing binne die genus as 'n geheel. Vorige werk, uitsluitlik gebaseer op morfologiese en palinologiese kenmerke, was tot dusver nog net gedeeltelik suksesvol in die identifikasie van natuurlike groepe binne die inheemse taksa van die gebied. Onlangse studies op 'n paar inheemse spesies het die nut van die plastied trnL-trnF nie-koderende DNA area bevestig vir die rekonstruksie van filogenetiese verwantskappe in die genus. Hierdie studie is gerig op die taksonomiese monofilie en verwantskappe van die onnatuurlike seksie Angustatae subseksie Lineares, deur gebruik te maak van DNA basis-volgorde data. Die filogenetiese rekonstruksie van Suid Afrikaanse Oxalis spesies dui aan dat vyf van die subseksies van seksie Angustatae sensu Salter (1944) polifileties is, met sterk steun daarvoor dat drie van hulle onnatuurlik is. Die lede van subseksie Lineares is tussen drie verskillende groepe versprei; twee van dié groepe het sterk ondersteuning. Nie een van die drie groepe bestaan uitsluitlik uit spesies van subseksie Lineares nie. So ook is vier van die sewe groepe van verwante spesies binne subseksie Lineares sensu Salter (1944) polifileties. Stuifmeel data volgens Dreyer (1996) ondersteun die groepe wat deur die DNA volgordes uitgewys is, terwyl baie min morfologiese kenmerke gebruik kan word as potensiële sinapomorfe/kenmerke. Die filogenetiese rekonstruksie ondersteun dus die palinologiese data van die subseksie, en dui op die dringende behoefte aan 'n hersiening van die huidige morfologiese klassifikasie van Salter (1944).

No description available.

124 p. : maps, tables ; 26 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Botany, 1959

Thesis (Ph.D.)--University of Adelaide, Dept. of Botany, 1959.

No description available.

Thesis(M.S.)--Auburn University, 2006. / Abstract. Vita. Includes bibliographic references.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This works aims at caring out the survey of the genus Oxalis in the state of Rio Grande do Sul, offering means for the species identification. This study was carried out based on review of specialized literature and specific websites in the field of taxonomy; revision of the Herbarium; and field work, throughout the state. In Rio Grande do Sul, the genus Oxalis is represented by 27 species: Oxalis articulata Savigny, O. bifrons Progel, O. bipartita A. St.-Hil., O. brasiliensis G. Lodd., O. conorrhiza Jacq., O. corniculata L., O. cytisoides C. Mart. & Zucc., O. debilis Kunth, O. eriocarpa DC., O. floribunda Lehm., O. geralensis R. Knuth, O. hispidula Zucc., O. lasiopetala Zucc., O. latifolia Kunth, O. linarantha Lourteig, Oxalis lindneri R. Knuth, O. myriophylla A. St.-Hil., O. niederleinii R. Knuth, O. paludosa A. St.-Hil., O. perdicaria (Molina) Bertero, O. potamophila Lourteig, O. refracta A. St.-Hil., O. sarmentosa Zucc., O. sellowiana var. alba Múlgura, O. subvillosa Norlind, O. tenerrima R. Knuth e O. triangularis A. St.-Hil. One of these species is a new occurrence in Rio Grande do Sul State, Oxalis subvillosa. Other of them, Oxalis lindneri, is a new record in Brazil. Analytical key, morphological descriptions, illustrations and data concerning the habitat, distribution, flowering and fruiting period are supplied. / O objetivo deste trabalho foi o de realizar o levantamento do gênero Oxalis no estado do Rio Grande do Sul, fornecendo meios para a identificação de suas espécies. Este estudo foi realizado com base em revisão de literatura especializada e de sites específicos da área de taxonomia; revisão de herbários; e coleta de material a campo, abrangendo o Estado. No Rio Grande do Sul, o gênero Oxalis está representado por 27 espécies: Oxalis articulata Savigny, O. bifrons Progel, O. bipartita A. St.-Hil., O. brasiliensis G. Lodd., O. conorrhiza Jacq., O. corniculata L., O. cytisoides C. Mart. & Zucc., O. debilis Kunth, O. eriocarpa DC., O. floribunda Lehm., O. geralensis R. Knuth, O. hispidula Zucc., O. lasiopetala Zucc., O. latifolia Kunth, O. linarantha Lourteig, Oxalis lindneri R. Knuth, O. myriophylla A. St.-Hil., O. niederleinii R. Knuth, O. paludosa A. St.-Hil., O. perdicaria (Molina) Bertero, O. potamophila Lourteig, O. refracta A. St.-Hil., O. sarmentosa Zucc., O. sellowiana var. alba Múlgura, O. subvillosa Norlind, O. tenerrima R. Knuth e O. triangularis A. St.-Hil. Destas, duas representam novas ocorrências, Oxalis subvillosa no Rio Grande do Sul, e Oxalis lindneri, no Brasil. São fornecidos chave analítica, descrições morfológicas, ilustrações e dados sobre hábitat, distribuição, período de floração e frutificação.