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)

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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.

著者

Hidenori Nakamori Miki Tomita Hiroshi Azuma Takehiro Masuzawa Toru Tokuoka

出版者

日本植物分類学会

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.68, no.2, pp.83-92, 2017 (Released:2017-09-12)

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Miscanthus (Poaceae) comprises about 20 species, of which seven species and two forms occur in Japan. There is controversy whether M. condensatus is a separate species or a variety or subspecies of M. sinensis. To determine its taxonomic status, we conducted a molecular phylogenetic analysis using DNA sequences of the atpB-rbcL, psbC-trnS(UGA), rpl20-rps12, trnL(UAA)-trnF(GAA), trnS(GGA)- trnT(UGU), and nuclear ITS regions, and the Adh1 gene from 31 samples of the seven Japanese species of Miscanthus. The neighbor-joining (NJ) tree based on the cpDNA sequences shows that M. condensatus and M. sinensis share two haplotypes, and that the nuclear ITS and Adh1 sequences of the two species are identical, making it difficult to distinguish M. condensatus from M. sinensis based on DNA sequences. The evidence indicates that hybridization between the two species has proceeded rapidly, or that M. condensatus is derived from a diverging lineage of M. sinensis. The status of M. condensatus remains controversial, but our findings support provisionally treating M. condensatus as the infraspecific taxon, M. sinensis var. condensatus.

著者

SUZUKI TAKESHI WATANABE IWAO SHIRAIWA TAKUMI

出版者

日本植物分類学会

雑誌

APG : Acta phytotaxonomica et geobotanica (ISSN:13467565)

巻号頁・発行日

vol.56, no.1, pp.71-83, 2005-04-11

被引用文献数

2

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Samples of the aquatic floating fern Azolla japonica and its relatives (sect. Azolla) growing in 73 localities of Japan were analyzed by allozyme electrophoresis. Six allozyme types were recognized: AW, BW, BZ, TA, TO and YA types. Compared to the International Rice Research Institute (IRRI) accessions of Azolla by allozymes, the BZ and BW types had the same allozyme patterns as those of A. caroliniana and an artificial hybrid Azolla, respectively; It was supposed that both types had escaped from Azolla introduced to Japan for agricultural use on rice fields. The YA and AW types had very similar allozyme patterns to those of A. filiculoides and A. microphylla, respectively. The TA and TO types shared all allozyme bands except one. The TA and TO types were suggested to be closely related to A. rubra by allozyme comparison. Morphologically, it was suggested that numbers of septa in glochidia (spikelets on male massulae) differentiates the TA type from A. rubra, although only one sample of the TA type was observed. The TA (and possibly TO) type might be an independent species of genus Azolla, or true A. japonica.

著者

NAGAMASU HIDETOSHI KATO MAKOTO

出版者

日本植物分類学会

雑誌

APG : Acta phytotaxonomica et geobotanica (ISSN:13467565)

巻号頁・発行日

vol.55, no.2, pp.75-78, 2004-08-25

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A new species, Nothapodytes amamianus Nagam. & Mak. Kato, is described from Amami-oshima, the Ryukyu Isls., and information on its pollination biology is presented. Nothapodytes amamianus is closely related to N. nimmonianus (J. Graham) Mabb., which is widely distributed from S. India to the Ryukyus (Yaeyama group), but is distinguished from the latter by the base of the leaves truncate or shortly cordate, the larger flowers with petals 7-9mm long, and the short but prominent anther connective. This new species is restricted to a small area on Amami-oshima and should be categorized as critically endangered. A key to the Japanese species of Nothapodytes is provided.

著者

ODA JIRO NAGAMASU HIDETOSHI

出版者

日本植物分類学会

雑誌

Acta phytotaxonomica et geobotanica : APG (ISSN:13467565)

巻号頁・発行日

vol.61, no.3, pp.145-150, 2011-02-21

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Carex noguchii J. Oda & Nagam. is described as new to science. It is similar to C. biwensis Franch. in having irregularly trigonous to pentagonous culms, many-flowered (ca. 30) spikes, and short (1.8-2.0mm long) perigynia. Carex noguchii is distinguished from the latter, however, by the dark brown basal leaf sheaths, wider and longer leaves, orbicular-ovoid perigynia, and achenes loosely enclosed by the perigynia, and micromorphologically by the absence of satellite bodies.

著者

KOBAYASHI TOMIKI SASAMURA KAZUYUKI WATANABE KUNIAKI MURATA JIN

出版者

日本植物分類学会

雑誌

APG : Acta phytotaxonomica et geobotanica (ISSN:13467565)

巻号頁・発行日

vol.59, no.1, pp.37-43, 2008-03-25

被引用文献数

1

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Based on morphology and chromosome numbers, Arisaema inaense (Seriz.) K. Sasamura et J. Murata is newly recognized at the rank of species and a new species A. nagiense T. Kobayashi, K. Sasamura et J. Murata is described. Both are diploid with 2n=26 and lack the accessory buds that always accompany the axillary buds of tetraploid plants of A. ovale Nakai. In the A. ovale group, A. nagiense is unique in the inflorescence unfolding before the leaf blade.