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Issue: Vol. 687 No. 2: 18 Feb. 2025
Type: Article
Published: 2025-02-18
DOI: 10.11646/phytotaxa.687.2.1
Page range: 127-175
Abstract views: 478
PDF downloaded: 19

Collection and taxonomic bias in herbarium specimens of Isodon (Lamiaceae)

College of Plant Protection, Henan Agriculture University, Zhengzhou 450002, China
College of Plant Protection, Henan Agriculture University, Zhengzhou 450002, China
Chloroplast genome Digitization Phylogenetic analysis Principal component analysis Morphological analysis Eudicots

Abstract

Isodon (Lamiaceae) is recognized as one of the largest and most taxonomically challenging genera worldwide. Nevertheless, research on the collection and taxonomic biases of Isodon remains limited. This study aimed to investigate the original materials’ status of Isodon, thus providing basic data for research on the systematics, biogeography, and conservation of the genus. Firstly, based on the iPlant database, the Catalogue of Life China, and the Catalogue of Life, the accepted species list of Isodon was obtained. Secondly, original materials of each species of Isodon were found by searching the Chinese Virtual Herbarium (CVH), the Global Biodiversity Information Facility (GBIF) and the Journal Storage (JSTOR), and the key information of each original material was recorded and analyzed. Finally, principal component analysis and cluster analysis were performed based on morphological characteristics of specimens, and phylogenetic analysis was performed based on the whole chloroplast genomes of Isodon spp. In this study, a total of 491 original materials of 85 species of Isodon were obtained. The type localities covered 18 countries, mainly distributed in the Hengduan Mountains. The preliminary results of morphological cluster analysis of various species in Isodon indicated that fruiting calyx shape and leaf shape can be used to distinguish species and can serve as auxiliary reference indexes for species classification. Inventory completeness remains deficient, and Isodon species collection suffers from the issues of overcollection and undersampling. Consequently, we recommend that the quality and quantity of Isodon collection should be improved to fully enable scientific research and maximize the application value in future collection digitization efforts.

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How to Cite

Ma, M. & Wang, X. (2025) Collection and taxonomic bias in herbarium specimens of Isodon (Lamiaceae). Phytotaxa 687 (2): 127–175. https://doi.org/10.11646/phytotaxa.687.2.1