Untangling the taxonomy of the Cladrastis clade (Leguminosae: Papilionoideae) by integrating phylogenetics and ecological evidence
Untangling the taxonomy of the Cladrastis clade (Leguminosae: Papilionoideae) by integrating phylogenetics and ecological evidence
复制标题
通过整合系统发育学和生态证据来理清 Cladrastis 分支（豆科：蝶形花亚科）的分类学
作者：
Duan, Lei;Harris, A. J.;Wen, Jun
Cladrastis 分支是豆科蝶形花亚科中早期分化的谱系。一些分类学上的不确定性限制了对其分类学的深入理解：（1）扁鹊属是否应该复活？ (2) Cladrastis应如何界定以维持属单系性？ (3) Styphnolobium 最好分为两部分还是三部分？我们通过整合系统发育分析、形态学和多变量生态方法的证据来评估该进化枝内的特定/部分/通用边界。通过对进化枝的广泛采样，我们使用 nrDNA (ITS) 和质体 DNA 区域（matK、psbA-trnH、trnL-F）重建了系统发育。基于 841 次事件的环境数据，通过主成分分析 (PCA) 根据其环境偏好寻找物种簇，并使用生态位模型 (ENM) 测试关于物种/区域边界的明确假设。一个新的部落，Cladrastideae，是在 Cladrastis 分支的基础上建立的，有四个单系类群：Cladrastis platycarpa 复合体、Cladrastis s.str.、Pickeringia 和 Styphnolobium。 C. platycarpa 复合体构成了复活的 Platyosprion 属。建议将推定种 C. chingii、C. parvifolia、C. scandens 和 C. yungchunii 视为 Platyosprion platycarpum 的异名。 Cladrastis 被重新划定为与 Cladrastis s.str. 相同，其中 3 个种来自东亚，其中 1 个种 C. kentukea 来自北美东部。 Styphnolobium在此被分为三个部分：St. sect。奥雷斯比奥斯，圣教派。 Styphnolobium 和一个新的部分，St. sect。仿射。
The Cladrastis clade is an early-diverged lineage within the subfamily Papilionoideae of Leguminosae. Several taxonomic uncertainties limit a robust understanding of its taxonomy: (1) Should the genus Platyosprion be resurrected? (2) How should Cladrastis be delimited to maintain the generic monophyly? (3) Is Styphnolobium best classified into two or three sections? We assessed specific/sectional/generic boundaries within this clade by integrating evidence from phylogenetic analyses, morphology, and multivariate ecological methods. With an extensive sampling of the clade, we reconstructed the phylogenies using nrDNA (ITS) and plastid DNA regions (matK, psbA-trnH, trnL-F). Based on environmental data for 841 occurrences, clusters of species were sought according to their environmental preferences with the principal component analysis (PCA), and explicit hypotheses on species/sectional boundaries were tested using ecological niche modeling (ENM). A new tribe, Cladrastideae, is established based on the Cladrastis clade with four monophyletic groups: the Cladrastis platycarpa complex, Cladrastis s.str., Pickeringia and Styphnolobium. The C. platycarpa complex constitutes the resurrected genus Platyosprion. The putative species C. chingii, C. parvifolia, C. scandens and C. yungchunii are suggested to be treated as synonyms of Platyosprion platycarpum. Cladrastis is recircumscribed as equal to Cladrastis s.str., with three species from eastern Asia, and one species, C. kentukea, from eastern North America. Styphnolobium is herein classified into three sections: St. sect. Oresbios, St. sect. Styphnolobium and a new section, St. sect. Affine.