著者

Kenji Suetsugu Jing-Zhi Lin Tian-Chuan Hsu Hiroshi Hayakawa

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.71, no.2, pp.177-184, 2020-06-30 (Released:2020-07-31)

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Two closely related species, Spiranthes sinensis and S. australis (Orchidaceae), have often been distinguished based on the presence or absence of hairs in their inflorescence and on the stems and ovaries: the stems and ovaries of S. australis are generally pubescent, whereas those of S. sinensis are reported to be glabrous. Although S. australis has not been documented to occur in Taiwan, we found a population of Spiranthes with slightly pubescent stems and ovaries at Tahanshan, southern Taiwan. Because the slightly pubescent plants may represent an undocumented extension of the distribution of S. australis, we attempted to identity the slightly pubescent plants by sequencing the ITS and trnL–F intergenic spacer regions. We also compared the lip and column morphology, which have diagnostic characteristics in Spiranthes, and the molecular and morphological data from S. australis, S. sinensis, their close relative, S. hongkongensis, and the unknown plants. The molecular analysis revealed the slightly pubescent plants to be heterozygous for the ITS sequences from S. australis and S. sinensis or from S. hongkongensis and S. sinensis, whereas the trnL–F intergenic spacer region was identical to that of S. sinensis. While we could not completely exclude the possibility that the unknown plants were hybrids between S. hongkongensis and S. sinensis based on the molecular data, we concluded that they were hybrids between the pubescent S. australis and the glabrous S. sinensis (Taiwan type) based on the lip and column morphology.

著者

Kenji Suetsugu Hiroshi Hayakawa

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.70, no.3, pp.205-208, 2019-10-31 (Released:2019-11-28)

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The discovery of Spiranthes hongkongensis S. Y. Hu & Barretto (Orchidaceae) on Ishigaki Island, Japan, during herbarium studies in KPM is reported. Previously, S. hongkongensis was reported only from China (Guangdong, Hong Kong, Taiwan), and Malaysia (Borneo). Spiranthes hongkongensis is morphologically similar to S. australis, but is distinguishable by the membranous, narrow, truncate rostellum attached to the middle of the pollinia without a viscidium, shorter column and distinctly 3-lobed stigma.

著者

Hiroshi Hayakawa Kenji Suetsugu Shohei Fujimori Takuto Shitara Jun Yokoyama Tomohisa Yukawa

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.71, no.2, pp.163-169, 2020-06-30 (Released:2020-07-31)

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A new peloric form of Cephalanthera erecta (Thunb.) Blume (Orchidaceae) is reported from Hokkaido, Honshu, and Shikoku, Japan. Cephalanthera erecta f. pelorica Hiros. Hayak. & Suetsugu has an inconspicuous lip and stigmas positioned at the apex of the column. The flowers of C. erecta f. pelorica resemble those of the probable peloric form of C. erecta (i.e., C. erecta var. oblanceolata N. Pearce & P. J. Cribb, C. nanlingensis A. Q. Hu & F. W. Xing) and C. longifolia (L.) Fritsch. f. conformis Suetsugu & Hiros. Hayak. However, C. erecta f. pelorica can be distinguished from C. erecta var. oblanceolata, which has a swollen organ on the abaxial surface of the column apex (vs. no swollen organ); C. nanlingensis, which has two staminodes (vs. five staminodes), and C. longifolia f. conformis, which has elliptic, coriaceous leaves (vs. lanceolate, papyraceous leaves).

著者

高橋 圭子 早川 大 岡本 智寛 藤原 章司 矢島 仁 Keiko Takahashi Hiroshi Hayakawa Tomohiro Okamoto Shoji Fujiwara Hitoshi Yajima 東京工芸大学工学部生命環境化学科/ナノ化学科教授 東京工芸大学大学院工学研究科工業化学専攻博士前期課程 東京工芸大学工学部生命環境化学科学部4年生 東京工芸大学工学部工学研究科工業化学専攻博士後期課程 東京工芸大学芸術学部映像学科准教授

雑誌

東京工芸大学工学部紀要 = The Academic Reports, the Faculty of Engineering, Tokyo Polytechnic University (ISSN:03876055)

巻号頁・発行日

vol.36, no.1, pp.27-33, 2013

著者

Kenji Suetsugu Hiroshi Hayakawa

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.70, no.1, pp.49-55, 2019-02-28 (Released:2019-03-09)

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A new variety, Goodyera schlechtendaliana Rchb. f. var. yakushimensis Suetsugu & Hiros. Hayak. (Orchidaceae), from Yakushima and Okinawa, is described. It is distinguished from G. schlechtendaliana var. schlechtendaliana by a combination of morphological characters, such as straighter lateral sepals, straighter lip, sparsely hairy inside the concave-saccate hypochile, and slender leaves.