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.

中文翻译：

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结合系统发育学和生态学证据，解开了克拉德斯枝（Leguminosae：Papilionoideae）的分类学。

在香槐枝是豆科的蝶形花亚科内的早期分歧血统。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）侧柏亚目应否复活？（2）克拉德斯应如何划界以维持一般的单一性？（3）茎突草最好分为两部分或三部分吗？我们通过整合来自系统发育分析，形态学和多元生态学方法的证据，评估了该进化枝内的特定/部分/一般界限。通过对进化枝的大量采样，我们使用nrDNA（ITS）和质体DNA区域（matK，psbA-trnH，trnL-F）。根据841次事件的环境数据，根据物种的环境偏好，通过主成分分析（PCA）寻找物种簇，并使用生态位模型（ENM）对物种/区域边界的明确假设进行了测试。一个基于Cladrastis进化枝的新部落Cladrastideae，该进化枝具有四个单系群：Cladrastis platycarpa复合体，Cladrastis s.str。，Pickeringia和Styphnolobium。该Ç。platycarpa复杂构成复活属Platyosprion。推定种C. chingii，C。parvifolia，C.藤和C. yungchunii是建议被视为同义词Platyosprion platycarpum。香槐被recircumscribed为等于香槐s.str，有三个品种从亚洲东部，和一个物种，C. kentukea，从北美东部。Styphnolobium在本文中被分为三个部分：圣。教派。Oresbios，圣。教派。鼠疫和新的部分，圣。教派。仿射。