Phylogeny of Rhododendron section Vireya (Ericaceae) based on two non-coding regions of cpDNA |
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Authors: | G K Brown L A Craven F Udovicic P Y Ladiges |
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Institution: | (1) School of Botany, The University of Melbourne, Melbourne, Victoria, 3010, Australia;(2) CPBR, CSIRO Plant Industry, Australian National Herbarium, Canberra, 2601, Australia;(3) National Herbarium of Victoria, Birdwood Ave, Melbourne, Victoria, 3141, Australia |
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Abstract: | Section Vireya (Blume) Copel.f. is one of the most morphologically diverse groups of the genus Rhododendron. Vireyas have a unique distribution for the genus, being predominantly found throughout the Malesian Archipelago. The alpha
taxonomy of section Vireya is relatively well understood and taxa are easily distinguished from other rhododendrons by their general appearance. Defining
characteristics of the section the possession of seeds with tailed appendages at both ends, the twisting of capsule valves
after opening, placentas that separate as thread-like structures from the central axis as the capsule opens are all subject
to exceptions.
Phylogenetic analyses of two cpDNA regions, psbA-trnH and trnT-trnL intergenic spacers are reported. The results of each analysis were generally congruent, with clades relating strongly to
geographic areas. Section Vireya is monophyletic with the inclusion of at least one species of section Rhododendron. Only two of the seven subsections currently circumscribed are monophyletic: Malayovireya Sleumer and Siphonovireya Sleumer. ``Euvireya', all subsections excluding the paraphyletic subsection Pseudovireya, is monophyletic and includes two major clades, one restricted to eastern Malesia and the other to the western and middle
Malesia. |
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Keywords: | Bayesian inference cpDNA morphology parsimony phylogeny psbA-trnH intergenic spacer Rhododendron section Vireya trnT-trnL intergenic spacer |
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