A biosystematic study of Pelargonium section Ligularia: 3. Reappraisal of section Jenkinsonia

Walt, J.J.A. van der; Albers, Focke; Gibby, Mary; Marschewski, D.E.; Hellbrügge, Dorothea; Price, Robert A.; Merwe, A.M. van der

doi:10.1016/s0254-6299(15)30686-4

Cited by 13 publications

(9 citation statements)

References 12 publications

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“…The large-chromosome sublineage with basic chromosome number x ϭ 11 comprises sections Myrrhidium and Chorisma and is sister to a lineage comprising section Jenkinsonia and P. mutans. Section Myrrhidium contains short-lived perennial subshrubs (van der Walt and Boucher, 1986), whereas section Chorisma contains (sub)shrubs, sometimes with root tubers and with herbaceous to succulent stems (Albers et al, 1995). Our data confirm the recognition of section Chorisma sensu Albers et al (1995) and indicate that it is sister to the lineage containing species from section Myrrhidium, represented here by P. caucalifolium Jacq.…”

Section: Discussionsupporting

confidence: 82%

“…Whereas proliferation within the small chromosome lineage has been extensive, including a range of growth forms and 11 recognized sections (covering ϳ80% of species), the large chromosome lineage of Pelargonium contains only (sub)shrubs, some of them with succulent stems, and one or two herbaceous annual species. Biogeographically, the contrast between the two lineages is extended further in that the small chromosome lineage is largely confined to the South African Western Cape region, whereas large chromosome Pelargonium species occur mainly in the Eastern Cape, tropical east Africa, the Arabian Peninsula, Madagascar, and Asia Minor (van der Walt and Vorster, 1983). In a previous study (Bakker et al, 1999) we discussed the hypothesis that the proliferation of lineages in the small-chromosome clade may have been triggered by the late Pliocene aridifications and establishment of a winter rainfall climate in the Western Cape region.…”

Section: Discussionmentioning

confidence: 99%

“…The genus Pelargonium L'Hér. (Geraniaceae) has been the subject of a range of systematic and taxonomic studies based on data from morphology, palynology, karyology, phytochemistry (e.g., Albers and van der Walt, 1984;Gibby and Westfold, 1986;van der Walt, 1990;Albers, Gibby, and Austmann, 1992;Dreyer et al, 1992;Gibby et al, 1996;Stafford and Gibby, 1992;van der Walt et al, 1995), and DNA sequences (Jones and Price, 1996;Bakker et al, 1998Bakker et al, , 1999. Overall phylogenetic relationships across the genus, however, are not clear.…”

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confidence: 99%

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Mitochondrial and chloroplast DNA‐based phylogeny of Pelargonium (Geraniaceae)

Bakker

Culham²,

Pankhurst³

et al. 2000

American J of Botany

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Overall phylogenetic relationships within the genus Pelargonium (Geraniaceae) were inferred based on DNA sequences from mitochondrial(mt)-encoded nad1 b/c exons and from chloroplast(cp)-encoded trnL (UAA) 5' exon-trnF (GAA) exon regions using two species of Geranium and Sarcocaulon vanderetiae as outgroups. The group II intron between nad1 exons b and c was found to be absent from the Pelargonium, Geranium, and Sarcocaulon sequences presented here as well as from Erodium, which is the first recorded loss of this intron in angiosperms. Separate phylogenetic analyses of the mtDNA and cpDNA data sets produced largely congruent topologies, indicating linkage between mitochondrial and chloroplast genome inheritance. Simultaneous analysis of the combined data sets yielded a well-resolved topology with high clade support exhibiting a basic split into small and large chromosome species, the first group containing two lineages and the latter three. One large chromosome lineage (x = 11) comprises species from sections Myrrhidium and Chorisma and is sister to a lineage comprising P. mutans (x = 11) and species from section Jenkinsonia (x = 9). Sister to these two lineages is a lineage comprising species from sections Ciconium (x = 9) and Subsucculentia (x = 10). Cladistic evaluation of this pattern suggests that x = 11 is the ancestral basic chromosome number for the genus.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Mitochondrial and chloroplast DNA‐based phylogeny of Pelargonium (Geraniaceae)

Bakker

Culham²,

Pankhurst³

et al. 2000

American J of Botany

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“…Jenkinsonia and P. myrrhifolium from sect. Chorisma are annuals or short-lived perennials van der Walt & al., 1997). Flowers of species in sect.…”

Section: Discussionmentioning

confidence: 99%

“…Petal-number reduction from 5 to 4 appears to be confined to clade C1 with further occurrences in P. praemorsum and P. mutans. The position of P. antidysentericum as sister to C1 is not wellsupported and may resolve using more characters, although this species was found not to group with the main Jenkinsonia clade based on rbcL sequences (van der Walt & al., 1997). Perlargonium antidysentericum is a much-branched shrub growing from a large, partly subterranean tuber, and is distributed in the Namaqualand area.…”

Section: Discussionmentioning

confidence: 99%