Recircumscription of Begonia sect. Baryandra (Begoniaceae): evidence from molecular data
Botanical Studies, 2013•Springer
Abstract Background Begonia sect. Diploclinium is a 'dust-bin'section for species retaining
pleisiomorphic characters and lacking novel synapomorphic characters used to delimit other
Asian sections in Begonia. Part of this large and polymorphous section is transferred to
Begonia sect. Baryandra in a move towards a more natural classification for the genus.
Results Phylogenetic analysis of nuclear ribosomal ITS DNA sequences show a strongly
supported monophyletic group containing Philippine and Bornean species previously in …
pleisiomorphic characters and lacking novel synapomorphic characters used to delimit other
Asian sections in Begonia. Part of this large and polymorphous section is transferred to
Begonia sect. Baryandra in a move towards a more natural classification for the genus.
Results Phylogenetic analysis of nuclear ribosomal ITS DNA sequences show a strongly
supported monophyletic group containing Philippine and Bornean species previously in …
Background
Begonia sect. Diploclinium is a ‘dust-bin’ section for species retaining pleisiomorphic characters and lacking novel synapomorphic characters used to delimit other Asian sections in Begonia. Part of this large and polymorphous section is transferred to Begonia sect. Baryandra in a move towards a more natural classification for the genus.
Results
Phylogenetic analysis of nuclear ribosomal ITS DNA sequences show a strongly supported monophyletic group containing Philippine and Bornean species previously in Begonia sect. Diploclinium, and the type of Begonia sect. Baryandra, B. oxysperma. This clade forms the basis for the now much-expanded Begonia sect. Baryandra, which as defined here contains 49 species and has its centre of diversity in the Philippines.
Conclusions
A natural classification for a much expanded Begonia sect. Baryandra has been provided. This paper highlights the feasibility of moving towards a natural classification of Asian Begonia step by step as information comes to light through building upon previous framework phylogenies with denser sampling.
Springer
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