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Issue: Vol. 652 No. 2: 5 Jun. 2024
Type: Article
Published: 2024-06-05
DOI: 10.11646/phytotaxa.652.2.1
Page range: 83-99
Abstract views: 844
PDF downloaded: 301

Taxonomic revision of the formerly monotypic orchid genus Dactylostalix

Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501, Japan. The Institute for Advanced Research, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501, Japan.
Botanical Gardens, Osaka Metropolitan University, 2000 Kisaichi, Katano City, Osaka, 576-0004, Japan
The Mt. Fuji Institute for Nature and Biology, Showa University, 4562 Kamiyoshida, Fujiyoshida, Yamanashi, 403-0005, Japan. Division of Academic Resources and Specimens, Hokkaido University Museum, Kita 10-jo, Nishi 8-chome, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
Tsukuba Botanical Garden, National Museum of Nature and Science, 1-1, Amakubo 4, Tsukuba, 305-0005, Japan
Field Science Center, Graduate School of Agricultural Science, Tohoku University, 232-3 Yomogida, Naruko-onsen, Osaki, Miyagi 989-6711, Japan
emended description genetics morphology new combination taxonomy typification Monocots

Abstract

The Calypsoinae orchid genus Dactylostalix, previously considered a monotypic genus endemic to Japan and the Russian Far East (the Kuril Islands and Sakhalin Island), is now redefined to encompass two species. This reclassification is based not only on the examination of type specimens and literature but also on molecular data. While Pergamena uniflora has long been regarded as a synonym of Dactylostalix ringens, it is distinguishable by its shorter scape, smaller flower, less spotted tepals, drooping sepals and lateral petals, labellum with smaller, narrowly triangular to ovate lateral lobes, more distinct keels on the adaxial surface of the lip, and a slender column with a smaller stigma and weakly developed clinandrium. We propose the new combination Dactylostalix uniflora, recognizing it as a distinct species within the genus Dactylostalix. Phylogenetic analysis utilizing genome-wide markers has also demonstrated that the two species are genetically distinct. Our findings, obtained through the integration of morphological data and molecular phylogenetics, indicate that D. uniflora represents a distinct evolutionary lineage from D. ringens. Examination of type specimens has led us to conclude that Calypso japonica, Dactylostalix maculosa, and Dactylostalix ringens f. punctatus are junior synonyms of D. ringens. Additionally, we designate the lectotypes for P. uniflora (= D. uniflora), C. japonica, and D. maculosa.

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