Phylogenetics, morphological evolution, and classification of Euphorbia subgenus Euphorbia
Phylogenetics, morphological evolution, and classification of Euphorbia subgenus Euphorbia
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DOI：
10.12705/622.1
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发表时间：
2013-04-01
期刊：
影响因子：
3.4
通讯作者：
Berry, Paul E.
中科院分区：
文献类型：
--
作者：
Dorsey, Brian L.;Haevermans, Thomas;Berry, Paul E.
大戟属大戟属（Euphorbia）是大戟属（Euphorbia）四个亚属中最大和最多样化的一个，分布于热带和亚热带。在这个组内的关系一直难以辨别，主要是由于homoplasious形态特征和不充分的分类单元采样在以前的系统发育研究。在这里，我们提出了一个系统发育分析E。subg.大戟属，使用一个核和两个质体区域，最完整的采样的分子序列数据的日期。我们分配661种的亚属，并表明，它是由四个高度支持的分支，包括一个单一的新世界的分支和多个独立的血统马达加斯加。使用这个系统发育框架，我们讨论形态进化和一般模式的同源性。最后，提出了一个新的E. subg.大戟属包括21组，其中9个是新描述的。
Euphorbia subg. Euphorbia is the largest and most diverse of four recently recognized subgenera within Euphorbia and is distributed across the tropics and subtropics. Relationships within this group have been difficult to discern due mainly to homoplasious morphological characters and inadequate taxon sampling in previous phylogenetic studies. Here we present a phylogenetic analysis of E. subg. Euphorbia, using one nuclear and two plastid regions, for the most complete sampling of molecular sequence data to date. We assign 661 species to the subgenus and show that it is comprised of four highly supported clades, including a single New World clade and multiple independent lineages on Madagascar. Using this phylogenetic framework we discuss patterns of homoplasy in morphological evolution and general patterns of biogeography. Finally, we present a new sectional classification of E. subg. Euphorbia comprising 21 sections, nine of them newly described here.