Abstract
Paralamium (Lamiaceae) is a monotypic genus within the subfamily Lamioideae and has a sporadic distribution in subtropical mountains of southeast Asia. Although recent studies have greatly improved our understanding of generic relationships within Lamioideae, the second most species-rich subfamily of Lamiaceae, the systematic position of Paralamium within the subfamily remains unclear. In this study, we investigate the phylogenetic placement of the genus using three datasets: (1) a 69,276 bp plastome alignment of Lamiaceae; (2) a five chloroplast DNA region dataset of tribe Pogostemoneae, and (3) a nuclear ribosomal internal transcribed spacer region dataset of Pogostemoneae. These analyses demonstrate that Paralamium is a member of Pogostemoneae and sister to the monotypic genus Craniotome. In addition, generic-level phylogenetic relationships within Pogostemoneae are also discussed, and a dichotomous key for genera within Pogostemoneae is provided.
Highlights
Lamiaceae, as currently defined, contains about 7000 species and is subdivided into 12 subfamilies (Li et al, 2016; Li and Olmstead, 2017; Zhao et al, 2021)
The plastome size was 152,664 bp and displayed the typical quadripartite structure consisting of a pair of IR regions (25,617 bp) separated by the large single copy (LSC; 83,788 bp) and small single copy (SSC; 17,642 bp) regions (Supplementary Figure 1)
We used 79 common proteincoding genes for phylogenetic analyses based on Zhao et al (2021) with the exclusion of the ycf 15 gene because it could not be extracted from most plastome reassembed from Sequences Read Archive (SRA) database
Summary
As currently defined, contains about 7000 species and is subdivided into 12 subfamilies (Li et al, 2016; Li and Olmstead, 2017; Zhao et al, 2021). Systematic positions of several enigmatic genera which were previously unplaced within Lamioideae have been recently elucidated (Scheen et al, 2010; Bendiksby et al, 2011; Chen et al, 2014; Roy and Lindqvist, 2015; Olmstead, 2016; Zhao et al, 2021), while a few genera, namely the rare and monotypic Paralamium Dunn. The aforementioned Paralamium and Metastachydium have not been included in any published molecular phylogenetic study
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