Xanthium sect.Acanthoxanthium(Heliantheae,菊科)和被忽视的物种 Xanthium argenteum

IF 3 2区 生物学 Q2 EVOLUTIONARY BIOLOGY
Taxon Pub Date : 2024-09-13 DOI:10.1002/tax.13245
Eleonora Manzo, Sebastian Nillies, Diego G. Gutiérrez, José L. Panero, Christian Bräuchler, Salvatore Tomasello
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引用次数: 0

摘要

黄花属(Xanthium)是菊科一年生草本植物的一个属,因其风媒花粉、雌雄同株、雌花单生、雌花单生在奇特的刺状结构(花囊)中而在菊科中脱颖而出。黄花菜科Acanthoxanthium 原产于南美洲,其特点是叶片基部有三叉刺。过去对该科室的分类处理相互矛盾,有的认为有多达 6 个种,有的则认为只有一个多态种。共分析了 42 个 X. sect.Acanthoxanthium 的 42 个样本进行了分析,其中绝大多数取自标本馆中的标本,树龄在 20 年到 160 年之间。我们从 X. spinosum 的广泛分布区以及分布较窄的分类群中采集了多个样本,涵盖了该部分的整个形态变异范围。在可能的情况下,我们纳入了模式和原始材料。我们使用 Hyb-Seq 技术获得了约 1000 个单拷贝核基因和完整质粒体的信息。系统发生组数据已提交给基于聚合的物种划分方法(SPEEDEMON)。此外,我们还对叶片轮廓进行了几何形态计量分析。结果有力地支持了该区系中四个品系的鉴定,赞成接受迄今为止描述的四个物种,即 X. ambrosioides、X. argenteum、X. catharticum 和 X. spinosum。这些结果在一定程度上得到了形态计量分析的证实。根据叶片形态,X. ambrosioides 与 X. spinosum 有明显区别,但在 X. spinosum 和 X. catharticum 之间没有观察到这种区别。然而,X. catharticum 与 X. spinosum 的生态要求不同,它更适应新热带地区的高山环境。耐人寻味的是,X. argenteum--一个从单一标本馆藏品中描述的分类群--也被推断为一个物种。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Species delimitation in Xanthium sect. Acanthoxanthium (Heliantheae, Asteraceae) and the neglected species Xanthium argenteum
Xanthium is a genus of annual herbaceous plants that stands out within Asteraceae for being wind‐pollinated, diclinous monoecious, and bearing solitary pistillate flowers in peculiar spiny structures (burs). Xanthium sect. Acanthoxanthium is native to South America and characterized by the presence of trifurcate spines at the base of the leaves. Past taxonomic treatments of the section have been contradictory, some recognising up to six species, others reducing all to a single polymorphic species. Altogether, 42 samples of X. sect. Acanthoxanthium were analysed, the vast majority taken from herbarium specimens between 20 and 160 years old. We sampled multiple specimens of X. spinosum from throughout its broad range as well as those taxa with narrower distributions, covering the whole range of morphological variation in the section. When possible, we included types and original material. We used Hyb‐Seq techniques to obtain information from about 1000 single‐copy nuclear genes and complete plastomes. Phylogenomic data were submitted to coalescent‐based species delimitation approaches (SPEEDEMON). Additionally, we performed geometric morphometric analysis of leaf outlines. The results strongly support the identification of four lineages in the section favouring the acceptance of four of the hitherto described species, i.e., X. ambrosioides, X. argenteum, X. catharticum, and X. spinosum. These results were to some extent corroborated by morphometric analyses. While X. ambrosioides was well distinct from X. spinosum based on leaf morphology, such difference was not observed between X. spinosum and X. catharticum. However, X. catharticum differs from X. spinosum in its ecological requirements, being a species rather adapted to high‐mountain environments of the Neotropics. Intriguingly, X. argenteum – a taxon described from a single herbarium collection – was also inferred as a species.
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来源期刊
Taxon
Taxon 生物-进化生物学
CiteScore
4.70
自引率
8.80%
发文量
177
审稿时长
6-12 weeks
期刊介绍: TAXON is the bi-monthly journal of the International Association for Plant Taxonomy and is devoted to systematic and evolutionary biology with emphasis on plants and fungi. It is published bimonthly by the International Bureau for Plant Taxonomy and Nomenclature, c/o Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 9, SK-845 23 Bratislava, SLOVAKIA. Details of page charges are given in the Guidelines for authors. Papers will be reviewed by at least two specialists.
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