Chamaecrista with > 330 species, six sections, three subsections and 39 series has had a long and complex taxonomic history. The genus is monophyletic, but most of its traditional infrageneric categories are not. To test the monophyly of sections, subsections and series of Chamaecrista, we used two molecular phylogenetic approaches. The first (Broad) based on two DNA regions (ITS and trnL-F) includes a comprehensive sampling of Chamaecrista spp. and infrageneric taxa. The second (Multilocus) is based on four molecular regions (ITS, ETS, trnL-F and trnE-T) for a smaller but representative sampling. We performed ancestral character reconstructions to identify morphological characters that could serve as synapomorphies for major clades. Both molecular approaches support Chamaecrista and sections Apoucouita, Grimaldia and Xerocalyx as monophyletic, but sections Chamaecrista, Caliciopsis and Absus and most of the series are not monophyletic. The four main clades recovered are all characterized by a combination of morphological characters: a clade of tree species with cauliflorous inflorescences (including species of section Apoucouita); a mostly Brazilian campo rupestre clade (including all species of subsections Adenophyllum, Baseophyllum and Otophyllum); a clade of mostly herbaceous/shrubby species with solitary flowers or fascicles (including sections Chamaecrista, Caliciopsis and Xerocalyx and extra-American species) and a clade (with three main subclades) of species with viscous indumentum (including section Grimaldia and section Absus subsection Absus). We propose a new infrageneric classification for Chamaecrista supported by molecular phylogenetic analyses and morphology, recognizing the four main clades as sections Apoucouita, Baseophyllum, Chamaecrista and Absus, the last with three subsections (Absus, Viscosa and Zygophyllum), but we do not recognize any previously circumscribed series. Our taxonomic treatment includes descriptions of and a key to the newly defined infrageneric taxa and an updated species list for the genus under the new classification.

中文翻译：

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基于综合分子系统发育分析和形态学的泛热带属 Chamaecrista（豆科：Caesalpinioideae）的新属下分类

Chamaecrista 与 > 6科3亚科39系330种，分类历史悠久而复杂。该属是单系的，但其大多数传统的亚属类别不是。为了测试 Chamaecrista 的部分、小部分和系列的单一性，我们使用了两种分子系统发育方法。第一个（广泛）基于两个 DNA 区域（ITS 和 trnL-F），包括对 Chamaecrista spp 的全面采样。和亚属类群。第二个（多位点）基于四个分子区域（ITS、ETS、trnL-F 和 trnE-T），用于较小但具有代表性的采样。我们进行了祖先特征重建，以识别可以作为主要进化枝突触的形态特征。两种分子方法都支持 Chamaecrista 和 Apoucouita 部分，Grimaldia 和 Xerocalyx 是单系的，但部分 Chamaecrista、Caliciopsis 和 Absus 以及该系列的大部分都不是单系的。恢复的四个主要进化枝都具有形态特征的组合特征：具有花椰菜花序的树种进化枝（包括 Apoucouita 部分的物种）；一个主要是巴西的 campo rupestre 进化枝（包括 Adenophyllum、Baseophyllum 和 Otophyllum 小节的所有物种）；一个主要是草本/灌木物种的进化枝，具有单生花或簇（包括部分 Chamaecrista、Caliciopsis 和 Xerocalyx 以及美洲外物种）和一个进化枝（具有三个主要子进化枝）具有粘性毛被的物种（包括 Grimaldia 部分和 Absus 部分 Absus ）。我们提出了由分子系统发育分析和形态学支持的 Chamaecrista 的新属下分类，将四个主要进化枝识别为 Apoucouita、Baseophyllum、Chamaecrista 和 Absus 部分，最后一个有三个子部分（Absus、Viscosa 和 Zygophyllum），但我们不承认任何以前限定的系列。我们的分类处理包括新定义的亚属分类群的描述和关键，以及新分类下属的更新物种列表。