A subgeneric classification of Selaginella (Selaginellaceae)
A subgeneric classification of Selaginella (Selaginellaceae)
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DOI：
10.3732/ajb.1600288
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发表时间：
2016-12-01
影响因子：
3
通讯作者：
Korall, Petra
中科院分区：
文献类型：
--
作者：
Weststrand, Stina;Korall, Petra
研究前提：石松科卷柏科包括全世界约 750 种草本植物，主要物种丰富度在热带和亚热带。我们最近提出了基于DNA序列数据的卷柏科系统发育分析，并以系统发育为框架，重点讨论了该类群的总体形态特征演化。在这里，我们将这些发现转化为新的分类。 方法：为了提出一个稳健且有用的分类，我们从之前对 223 个物种的系统发育分析中确定了得到充分支持的单系群，这些群共同代表了该科在形态、分类和地理分布方面的多样性。谨慎选择具有支持形态学的群体。关键结果：在该分类中，我们识别出卷柏属一个属和七个亚属：卷柏属、Rupestrae、Lepidophyllae、Gymnogynum、Exaltatae、Ericetorum 和 Stachygynandrum。基于 DNA 序列数据和形态学的分析，这些亚属都得到了很好的支持。提出了亚属的关键。结论：我们的新分类基于卷柏进化关系的有充分依据的假设，每个亚属都可以通过一系列形态特征来识别，其中大多数可以在现场研究。我们的目的是，该分类不仅对该领域的专家有用，而且对更广泛的受众也有用。
PREMISE OF THE STUDY: The lycophyte family Selaginellaceae includes approximately 750 herbaceous species worldwide, with the main species richness in the tropics and subtropics. We recently presented a phylogenetic analysis of Selaginellaceae based on DNA sequence data and, with the phylogeny as a framework, the study discussed the character evolution of the group focusing on gross morphology. Here we translate these findings into a new classification.METHODS: To present a robust and useful classification, we identified well-supported monophyletic groups from our previous phylogenetic analysis of 223 species, which together represent the diversity of the family with respect to morphology, taxonomy, and geographical distribution. Care was taken to choose groups with supporting morphology.KEY RESULTS: In this classification, we recognize a single genus Selaginella and seven subgenera: Selaginella, Rupestrae, Lepidophyllae, Gymnogynum, Exaltatae, Ericetorum, and Stachygynandrum. The subgenera are all well supported based on analysis of DNA sequence data and morphology. A key to the subgenera is presented.CONCLUSIONS: Our new classification is based on a well-founded hypothesis of the evolutionary relationships of Selaginella, and each subgenus can be identified by a suite of morphological features, most of them possible to study in the field. Our intention is that the classification will be useful not only to experts in the field, but also to a broader audience.