Phylogeny of the Elaeodendron Group (Celastraceae) Inferred from Morphological Characters and Nuclear and Plastid Genes
The phylogeny of the Elaeodendron group was inferred in a simultaneous analysis of morphological characters together with nuclear (ITS and 26S rDNA) and plastid (matK, trnL-F region) genes. The circumscription of genera in this group has long been controversial, particularly
with respect to Cassine and Elaeodendron. Cassine, narrowly defined so as to include three species native to southern Africa, was unambiguously supported as distinct from Elaeodendron. The widely distributed genus Elaeodendron was supported as a natural group,
sister to Pleurostylia. Brexia, which has been variously assigned to the Escalloniaceae, Brexiaceae, and Grossulariaceae, was unambiguously supported as the sister group to the clade of Elaeodendron and Pleurostylia. Preliminary species sampling supported Empleuridium,
which had been classified within the Rutaceae, as closely related to Mystroxylon, Pseudosalacia, and Robsonodendron. Allocassine and Lauridia were resolved as closely related to one another, supporting their previously inferred relationship. Maurocenia
and Cassine were supported as closely related to one another, with evidence for Maurocenia being nested within Cassine. Lydenburgia abbottii was resolved as closely related to Lydenburgia cassinoides, supporting its transfer from Catha. Three new combinations
are made:
Elaeodendron bupleuroides
(Guillaumin) R.H. Archer,
Elaeodendron parvifolium
R.H. Archer, and
Elaeodendron pininsulare
Hürl. subsp.
poyaense
(I.H. Müller) R.H. Archer.
Keywords: BREXIA; CASSINE; CELASTRACEAE; ELAEODENDRON; PROCESS PARTITIONS; SIMULTANEOUS ANALYSIS
Document Type: Regular Paper
Publication date: 01 July 2006
- Systematic Botany is the scientific journal of the American Society of Plant Taxonomists and publishes four issues per year.
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