Rubite Rosario Rivera, Hughes Mark, Alejandro Grecebio Jd, Peng Ching-I
Department of Biology, College of Arts and Sciences, University of the Philippines Manila, Padre Faura, Manila, 1000, Philippines.
Royal Botanic Garden Edinburgh, 20a Inverleith Row, Edinburgh, EH3 5LR, UK.
Bot Stud. 2013 Dec;54(1):38. doi: 10.1186/1999-3110-54-38. Epub 2013 Sep 24.
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.
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.
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.
秋海棠属的双萼组是一个“垃圾桶”类群，用于容纳保留原始性状且缺乏用于界定秋海棠属其他亚洲类群的新合征的物种。这个庞大且多态的类群的一部分被转移到秋海棠属的重檐组，以实现该属更自然的分类。
对核糖体ITS DNA序列的系统发育分析显示，一个得到有力支持的单系类群包含先前在秋海棠属双萼组中的菲律宾和婆罗洲物种，以及秋海棠属重檐组的模式种尖果秋海棠。这个分支构成了现在大幅扩展的秋海棠属重檐组的基础，这里定义的重檐组包含49个物种，其多样性中心在菲律宾。
为大幅扩展的秋海棠属重檐组提供了一个自然分类。本文强调了随着通过在先前的框架系统发育基础上进行更密集采样而获得更多信息，逐步实现亚洲秋海棠自然分类的可行性。
