- 著者
- Kenji Suetsugu Tian-Chuan Hsu
- 出版者
- The Japanese Society for Plant Systematics
- 雑誌
- Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
- 巻号頁・発行日
- vol.74, no.3, pp.177-182, 2023-10-31 (Released:2023-11-04)
This is the first report of Taeniophyllum complanatum from Yakushima Island, Amami-Oshima Island, and Okinawa Island, Ryukyu Islands, Japan. The species is rare and was previously considered to be endemic to Taiwan. It is distinguishable from T. aphyllum by its strongly flattened roots, minutely papillate inflorescences and the shape of the fully developed fruit.
- 著者
- Kenji Suetsugu Shun K. Hirota Koji Yonekura Atsushi Abe Yoshihisa Suyama Tian-Chuan Hsu
- 出版者
- The Japanese Society for Plant Systematics
- 雑誌
- Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
- 巻号頁・発行日
- vol.74, no.2, pp.121-129, 2023-07-31 (Released:2023-09-08)
The present study documents the first record of Thrixspermum annamense (Orchidaceae) from Iriomote Island, Ryukyu Islands, Japan, expanding its known distribution beyond Vietnam, Thailand, Taiwan, China, and Malaysia. While the morphologically similar taxon T. fantasticum is present on the island, it can be distinguished from T. fantasticum by its somewhat narrower and more rigid leaves, slightly narrower sepals, densely hairy midlobe of the lip, and the absence of two horn-like appendages at the base of the midlobe. A detailed morphological analysis also revealed that the plants discovered on Iriomote Island closely resemble T. annamense from Taiwan but show consistent morphological and molecular distinctions from T. annamense from Vietnam, the type locality. Despite those differences, the high similarity in gross morphology and most lip structures of the plants from Japan, Taiwan, and Vietnam indicates that they all belong to T. annamense at the species level. Consequently, considering the genetic and morphological differences, we propose resurrecting the name T. devolianum, originally described from Taiwan, and reclassifying it as a variety of T. annamense (T. annamense var. devolianum). A neotype for T. devolianum is also designated.
- 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)
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 Tian-Chuan Hsu
- 出版者
- The Japanese Society for Plant Systematics
- 雑誌
- Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
- 巻号頁・発行日
- vol.74, no.1, pp.39-45, 2023-02-28 (Released:2023-03-15)
The taxonomic status of Taeniophyllum aphyllum (Makino) Makino, described from Kochi, Japan, is reevaluated. It has often been treated as a synonym of T. glandulosum Blume from Java, Indonesia, but is distinguishable from T. glandulosum by the pubescence of the inflorescence rachis, the arrangement of the flowers, inflorescence length, and shape of the fully developed fruit. It is therefore proposed that T. aphyllum is recognized as a distinct species. A lectotype for T. aphyllum is also proposed.