Ochagavia (four species) and Fascicularia (one species) form a well-supported clade of the early-diverging Bromelioideae. The two genera are morphologically similar, but they can be easily discerned on the basis of generative characters. Besides the species distributed on the Chilean mainland, the group includes O. elegans, endemic to the Robinson Crusoe Island of the Juan Fernández Islands. In previous molecular phylogenetic studies, O. elegans formed a sister clade to the remainder of Fascicularia and Ochagavia. A phylogenomic approach, including nearly complete and, in five cases, full plastomes (c. 160 kbp) and the nuclear rDNA cistron (c. 6 kbp), and scanning electron microscope (SEM) images of pollen were used to analyse relationships in the Fascicularia-Ochagavia group. Plastome and nuclear trees were largely congruent and supported previous phylogenetic analyses of O. elegans being sister to the remainder of the group. A divergent phylogenetic position was suggested for O. carnea using different organellar trees. SEM analysis of pollen supported the division of Fascicularia and Ochagavia. Evolutionary and taxonomic implications of our results are discussed.

中文翻译：

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对Fascicularia-Ochagavia组（凤梨科，凤梨科）的系统生物学见解

Ochagavia（4种）和Fascicularia（1种）形成了早散的凤梨科的有力支撑。这两个属在形态上相似，但是可以根据生成特征容易地辨别。除了分布在智利大陆的物种外，该群还包括线虫（O. elegans），该线虫是胡安·费尔南德斯群岛的鲁滨逊·克鲁索岛的特有物种。在先前的分子系统发育研究中，秀丽隐杆线虫形成了对Fascicularia和Ochagavia其余部分的姊妹进化枝。一个phylogenomic的办法，包括接近完成，并在5例，全plastomes（Ç。160 KBP）和核rDNA的顺反子（Ç。6 kbp），并用花粉的扫描电子显微镜（SEM）图像分析Fascicularia-Ochagavia组的关系。塑性树和核树在很大程度上是一致的，并支持以前的秀丽隐杆线虫的系统发育分析，该线虫是该组其余部分的姊妹。建议使用不同的细胞器树对角叉菜进行不同的系统发育。花粉的SEM分析支持了Fascicularia和Ochagavia的分裂。我们的结果的进化和分类学意义进行了讨论。