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Issue: Vol. 696 No. 1: 28 Mar. 2025
Type: Article
Published: 2025-03-28
DOI: 10.11646/phytotaxa.696.1.3
Page range: 55-70
Abstract views: 148
PDF downloaded: 18

New Species of Thalictrum (Ranunculaceae) from Okinawa Island in Japan and Its Phylogenetic Implications

Botanical Gardens, Tohoku University, Kawauchi 12-2, Aoba, Sendai 980-0862, Japan; Graduate School of Life Sciences, Tohoku University, Sendai 980-8578, Japan
Faculty of Science, University of the Ryukyus, Okinawa 903-0213, Japan
Okinawa Churashima Foundation Research Institute, Ishikawa, Motobu, Okinawa 905-0206, Japan
Department of Environment Science, University of Human Environments, Okazaki 444–3505, Japan
Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
Department of Botany, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan; The Mt. Fuji Institute for Nature and Biology, Showa Medical University, 4562 Kamiyoshida, Fujiyoshida, Yamanashi 403-0005, Japan
School of Forestry and Resource Conservation, National Taiwan University, Taipei, 10617, Taiwan; Grainger Bioinformatics Center, Field Museum of Natural History, Chicago, IL 60605, USA
Botanical Gardens, Tohoku University, Kawauchi 12-2, Aoba, Sendai 980-0862, Japan
Botanical Gardens, Tohoku University, Kawauchi 12-2, Aoba, Sendai 980-0862, Japan; Graduate School of Life Sciences, Tohoku University, Sendai 980-8578, Japan
meadow rue MIG-seq Ryukyu Archipelago Yakushima Island Yambaru National Park Eudicots

Abstract

This study aims to compare Thalictrum (Ranunculaceae) plant species, tentatively identified as T. minus, from the Yambaru region of Okinawa Island, Japan, with closely related species using morphometric and molecular phylogenetic analyses. Morphological observations revealed that the unique plants from Okinawa Island had clavate filaments and thickened roots. These traits differed significantly from those of typical T. minus, which have filamentous filaments and slender roots. Molecular phylogenetic analyses revealed that the unique plant on Okinawa Island is sister to T. urbaini, endemic to Taiwan, and formed a separate clade from those containing T. minus. Based on current morphological comparisons and molecular phylogenetic analyses, the unique plant on Okinawa Island was concluded to be a previously undescribed species, newly named Thalictrum yambaruense. Furthermore, our molecular phylogenetic analyses of Thalictrum in Japan and Taiwan revealed that T. tuberiferum var. yakusimense, endemic to Yakushima Island, Japan, is phylogenetically distinct from T. tuberiferum var. tuberiferum. Therefore, we propose elevating the taxonomic status of T. tuberiferum var. yakusimense to the species level as T. yakusimense.

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How to Cite

Michimoto, K., Yokota, M., Abe, A., Fujii, S., Takahashi, D., Kakishima, S., Yu, C.C., Ito, T. & Maki, M. (2025) New Species of Thalictrum (Ranunculaceae) from Okinawa Island in Japan and Its Phylogenetic Implications. Phytotaxa 696: 55–70. https://doi.org/10.11646/phytotaxa.696.1.3