Cremolobus is a genus of seven species distributed along the Andes from northern Argentina and Chile northward into Colombia, and it inhabits a variety of different environments from humid habitats, such as the Yungas in Bolivia and Argentina or the Andean Paramos in Colombia and Ecuador, to the arid regions of the Sechura Desert in Peru. This genus, together with Aimara and Menonvillea, form the South American tribe Cremolobeae, which is morphologically defined by the indehiscent and 1-seeded schizocarpic silicles. To date, phylogenetic analyses in the tribe were mainly focused on Menonvillea and Aimara, but there are no prior studies on Cremolobus. In this paper, we first studied the phylogenetic placement of Cremolobus within Cremolobeae using ribosomal nuclear (ITS) and chloroplast (trnL-F, trnH-psbA, rps16 intron) data, including a comprehensive sampling of taxa. We also analysed morphological variation among species, emphasizing habitat adaptation and characterizing main lineages within the genus. Additionally, we studied the biome/habitat preference by the species and main lineages of Cremolobus and other members of the tribe, as well as characterized their climatic niches along the environmental space. Results from our analyses support the monophyly of Cremolobus excluding C. subscandens and C. bolivianus, which are transferred here to the new genus Yunkia. Furthermore, species of Cremolobeae inhabit a wide diversity of habitats along the Andes that are associated with high ecomorphological diversity and, therefore, differing in this aspect from the related tribes Eudemeae and Schizopetaleae. Climatic niche comparison recovered low niche overlap between main lineages of the tribe, but high similarity among species of the same lineage, suggesting the presence of phylogenetic niche conservatism in the tribe. Systematic implications of these results, including a key distinguishing Yunkia from the remaining genera of Cremolobeae and a synopsis of its species, are also provided.

中文翻译：

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Cremolobus (Brassicaceae) 的分子系统发育支持对新属 Yunkia 的识别，并证明了 Cremolobeae 部落的高栖息地多样性

Cremolobus 是一个七种属，分布于安第斯山脉，从阿根廷北部和智利向北进入哥伦比亚，栖息于各种不同的环境，从潮湿的栖息地，如玻利维亚和阿根廷的 Yungas 或哥伦比亚和厄瓜多尔的安第斯帕拉莫斯，到秘鲁塞丘拉沙漠的干旱地区。该属与 Aimara 和 Menonvillea 一起形成南美部落 Cremolobeae，在形态上由不裂和 1 种子的裂果硅片定义。迄今为止，该部落的系统发育分析主要集中在 Menonvillea 和 Aimara，但之前没有关于 Cremolobus 的研究。在本文中，我们首先使用核糖体核 (ITS) 和叶绿体（trnL-F、trnH-psbA、rps16 内含子）数据研究了 Cremolobus 在 Cremolobeae 中的系统发育位置，包括对分类群的全面抽样。我们还分析了物种之间的形态变异，强调栖息地适应和属内的主要谱系特征。此外，我们研究了 Cremolobus 和部落其他成员的物种和主要谱系对生物群落/栖息地的偏好，并描述了它们沿环境空间的气候生态位。我们的分析结果支持 Cremolobus 的单系，不包括 C. subscandens 和 C. bolivianus，它们在此处转移到新属 Yunkia。此外，Cremolobeae 物种栖息在安第斯山脉沿线的多种栖息地，这些栖息地与高度的生态形态多样性相关，因此在这方面与相关的 Eudemeae 和 Schizopetaleae 部落不同。气候生态位比较发现该部落主要谱系之间生态位重叠较低，但同一谱系物种之间的相似性较高，表明该部落存在系统发育生态位保守性。还提供了这些结果的系统意义，包括区分 Yunkia 与 Cremolobae 其余属的关键及其物种概要。