著者
Toshio Katsuki
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.69, no.2, pp.119-126, 2018 (Released:2018-06-30)

A new species, Cerasus kumanoensis T. Katsuki (Rosaceae), sp. nov., is described from the southern Kii Peninsula, Japan. It is similar to C. jamasakura var. jamasakura and C. leveilleana because the corymbose inflorescences and extended peduncle are identical in these three taxa. However, C. kumanoensis is distinguished by several morphological and phenological characteristics, an earlier flowering period, narrowly ovate and smaller leaf blade (4–8 cm long, 1.8–3.6 cm wide) and glabrous petiole and pedicel.
著者
Kenji Suetsugu Hirokazu Fukunaga
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.69, no.1, pp.63-67, 2018 (Released:2018-03-02)

Here we describe a new variety of the mycoheterotrophic genus Lecanorchis, L. triloba J. J. Sm. var. clausa Suetsugu & Fukunaga, discovered during a botanical survey in Okinawa Island, Ryukyu Islands, Japan. The new variety resembles Lecanorchis triloba var. triloba due to its densely flowered rachis and small fruits. However, the new variety differs in that it has complete cleistogamous flowers and a nonrecurved and narrowly triangular midlobe of the lip.
著者
Kenji Suetsugu Takaomi Sugimoto
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.69, no.1, pp.69-74, 2018 (Released:2018-03-02)

We report three new localities of the mycoheterotrophic plant Sciaphila corniculata (Triuridaceae) from Ishigaki Island, Ryukyu Islands, Japan. Previously, S. corniculata was reported only from Kolombangara Island (Solomon Islands), Waigeo Island (New Guinea) and Obi and Aru islands (the Moluccas). We also update a description of its morphology, in particular on stylar characteristics based on new materials. A key to the Japanese species of Sciaphila based on total flower and stylar characteristics is also provided for easy identification of these rare mycoheterotrophic plants.
著者
Kenji Suetsugu Phetlasy Souladeth Shuichiro Tagane Tetsukazu Yahara
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.69, no.2, pp.139-141, 2018 (Released:2018-06-30)

A new locality of Lecanorchis taiwaniana from Nam Ha National Protected Area, Luang Namtha Province, northern Laos is reported and a description of the species based on the Laos material is provided. Lecanorchis taiwaniana was known previously only from Japan and Taiwan. Considering that species of Lecanorchis are easily overlooked in the wild due to their short flowering season and dwarf habit, it is possible that L. taiwaniana is more widely distributed.
著者
Yuki Wakasugi Hiroshi Azuma (Present Name: Suzuki) Akiyo Naiki Sachiko Nishida
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.68, no.3, pp.129-144, 2017 (Released:2017-11-24)

Geranium yesoense (Geraniaceae) includes several varieties that are mainly discriminated by two morphological features, namely, the degree of leaf incision and the density of spreading hairs on the sepals, but these features have never been objectively quantified. To clarify whether these features can truly discriminate varieties, we analyzed leaf shape and sepal pubescence, and conducted a molecular phylogenetic analysis using nuclear and chloroplast DNA. Our morphological analyses showed some trends in leaf morphology and density of hairs, but failed to identify any groupings that could be clearly distinguished on the basis of these features. Our molecular analysis recognized G. yesoense as a distinct taxon, but did not support the existence of subgroups within the species. We conclude that G. yesoense must be treated as a single taxon with some tendency toward morphological variation depending on locality and habitat.
著者
Kenji Suetsugu Arief Hidayat Hirokazu Tsukaya
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.69, no.2, pp.135-137, 2018 (Released:2018-06-30)

The discovery of a new locality of the mycoheterotrophic Gastrodia spathulata (Orchidaceae) in West Java, Indonesia, during herbarium studies in BO is reported. This species was previously considered an endemic species in Mt. Kinabalu, Sabah, Borneo.
著者
Kohtaroh Shutoh Shingo Kaneko Takahide Kurosawa
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.68, no.3, pp.181-192, 2017 (Released:2017-11-24)

Pyrola subaphylla (Pyroleae, Ericaceae), which generally produces reddish scapes and scale-like or extremely small leaves, has been treated as a variety or form of the closely related P. japonica, which generally has green scapes and fully developed leaves, owing to observations of individuals with intermediate morphology. Recently, these two taxa were shown to differ genetically, supporting recognition of P. subaphylla as a distinct species. We identified herbarium specimens as P. subaphylla when (1) at least three shoots were mounted on the same sheet, (2) leaf blades <3.0 cm in length were present on all mounted shoots, and (3) at least one flowering shoot either lacked ordinary leaves, which are distinguished from scale-like leaves with blade >1 cm long, or bore only a single ordinary leaf. A revised taxonomic treatment of the species is proposed. In Japan, P. subaphylla occurs in Hokkaidō, Honshū (Tōhoku and Chūbu district), and Shikoku, usually in coniferous forests at 0–1,500 m.
著者
Hiroyuki Akiyama
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.68, no.3, pp.145-174, 2017 (Released:2017-11-24)

Phylogenetic relationships among the members of the epiphytic genus Yakushimabryum H. Akiyama et al. and related genera (Pylaisiadelphaceae) were studied using cpDNA (rbcL, rps4, and trnL-F) gene sequences as well as morphological features. Present analyses (1) suggested the presence of three clades in the Pylaisiadelphaceae and Sematophyllaceae (Pylaisiadelphaceae s. str., Sematophyllaceae s. str. + Heterophyllioideae, and Clastobryum), and (2) confirmed the distinctive generic status of Yakushimabryum from other members of the family. One new genus Orientobryum H. Akiyama and two new species O. ovalifolium H. Akiyama and Y. brevigemmium H. Akiyama were recognized and described. In addition, a close inter-relationship of Pseudotrismegistia undulata (Broth. & Yasuda) H. Akiyama & Tsubota and Heterophyllium amblystegum (Mitt.) J. Yu et al. (= Mastopoma subfiliferum Horik. & Ando) was confirmed. Four new combinations, O. oligonema (Cardot & P. de la Varde) H. Akiyama (≡ Clastobryum oligonema Cardot & P. de la Varde), Y. subintegrum (P. Tixier) H. Akiyama (≡ Aptychella subintegra P. Tixier), Y. tonkinense (Broth.) H. Akiyama (≡ Clastobryum tonkinense Broth. & Paris), and Pseudotrismegistia amblystega (Mitt.) H. Akiyama (≡ Stereodon amblystegus Mitt.) were proposed.
著者
Kaori Horii Takashi Yamanouchi Yasuro Kadono
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.68, no.2, pp.111-116, 2017 (Released:2017-09-12)

Potamogeton ×tosaensis Kadono, Horii & Yamanouchi (Potamogetonaceae) is described here as a new hybrid. Although similar to P. octandrus, it is morphologically distinguishable in several traits. Most conspicuous of these are the connate stipules and fusiform turion bearing one acerose leaf. The plants were found only in and around Kochi City, Shikoku. Potamogeton octandrus and P. pusillus are the putative parents.