Aviles Peraza Gabriela, Koenen Erik J M, Riina Ricarda, Hughes Colin E, Ringelberg Jens J, Carnevali Fernández-Concha German, Ramírez Morillo Ivón Mercedes, Can Itza Lilia Lorena, Tamayo-Cen Ivan, Ramírez Prado Jorge Humberto, Cornejo Xavier, Mattapha Sawai, Duno de Stefano Rodrigo
Herbarium CICY, Centro de Investigación Científica de Yucatán, A.C. (CICY), Calle 43 No. 130, Col. Chuburna de Hidalgo, 97200, Mérida, Yucatán, Mexico Centro de Investigación Científica de Yucatán Mérida Mexico.
Evolutionary Biology & Ecology, Université Libre de Bruxelles, Av. F.D. Roosevelt, 50, CP 160/12, Brussels B-1050, Belgium Université Libre de Bruxelles Brussels Belgium.
PhytoKeys. 2022 Aug 22;205:371-400. doi: 10.3897/phytokeys.205.76821. eCollection 2022.
Following recent mimosoid phylogenetic and phylogenomic studies demonstrating the non-monophyly of the genus , we present a new molecular phylogeny focused on the neotropical species in the genus, with much denser taxon sampling than previous studies. Our aims were to test the monophyly of the neotropical section Arthrosamanea, resolve species relationships, and gain insights into the evolution of fruit morphology. We perform a Bayesian phylogenetic analysis of sequences of nuclear internal and external transcribed spacer regions and trace the evolution of fruit dehiscence and lomentiform pods. Our results find further support for the non-monophyly of the genus , and confirm the previously proposed segregation of , , and . All species that were sampled from section Arthrosamanea form a clade that is sister to a clade composed of , , and . We find that lomentiform fruits are independently derived from indehiscent septate fruits in both and section Arthrosamanea. Our results show that morphological adaptations to hydrochory, associated with shifts into seasonally flooded habitats, have occurred several times independently in different geographic areas and different lineages within the ingoid clade. This suggests that environmental conditions have likely played a key role in the evolution of fruit types in and related genera. We resurrect the name to accommodate the species of section Arthrosamanea, except for two species that were not sampled here but have been shown in other studies to be more closely related to other ingoid genera and we restrict the name s.s. to the species from Africa, Madagascar, Asia, Australia, and the Pacific. Twenty-one new nomenclatural combinations in are proposed, including 16 species and 5 infraspecific varietal names. In addition to the type species , the genus has 17 species distributed across tropical regions of the Americas, including the Caribbean. Finally, a new infrageneric classification into five sections is proposed and a distribution map of the species of is presented.
随着最近含羞草类系统发育和系统基因组学研究表明该属并非单系类群，我们提出了一种新的分子系统发育研究，重点关注该属的新热带物种，其分类群抽样比以前的研究更为密集。我们的目的是检验新热带区节肢含羞草组的单系性，解析物种关系，并深入了解果实形态的演化。我们对核内转录间隔区和外部转录间隔区序列进行了贝叶斯系统发育分析，并追踪了果实开裂和节荚的演化。我们的结果进一步支持了该属并非单系类群的观点，并证实了先前提出的将[具体物种名称1]、[具体物种名称2]、[具体物种名称3]和[具体物种名称4]进行分类的观点。从节肢含羞草组采样的所有物种形成一个分支，该分支是由[具体物种名称5]、[具体物种名称6]、[具体物种名称7]和[具体物种名称8]组成的分支的姐妹分支。我们发现节荚果实是在[具体属1]和节肢含羞草组中分别从不开裂的具隔膜果实独立演化而来的。我们的结果表明，与向季节性水淹生境转变相关的对水媒传播的形态适应，在不同地理区域和类叶豆类分支内的不同谱系中独立发生了多次。这表明环境条件可能在[具体属1]及相关属的果实类型演化中起到了关键作用。我们重新启用[具体名称]来容纳节肢含羞草组的物种，但不包括这里未采样的两个物种，这两个物种在其他研究中显示与其他类叶豆属关系更密切，并且我们将[具体名称]狭义地限定为来自非洲、马达加斯加、亚洲、澳大利亚和太平洋地区的物种。我们提出了21个[具体属1]的新命名组合，包括16个物种和5个种下变种名称。除了模式种[具体物种名称9]外，该属还有17个物种分布在美洲的热带地区，包括加勒比地区。最后，我们提出了一个新的属下分类，分为五个组，并给出了[具体属1]物种的分布图。
