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MASAYUKI TAKAMIYA, MITSURU WATANABE, KANJI ONO
Article type: Article
1998 Volume 48 Issue 2 Pages
89-121
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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Morphological and anatomical characteristics and geographical distribution patterns of Japanese Isoetes are described for each of the cytotypes which were determined in our previous cytological studies. A taxonomic treatment for Japanese Isoetes is given. We recognize six taxa of Isoetes in the Japanese flora: I. asiatica (2x), I. japonica (6x), a newly described species, I. pseudojaponica (8x), a newly described interspecific hybrid, I.× michinokuana (=I. japonica × I. pseudojaponica) (7x), I. sinensis var. sinensis (4x) and a new combination, I. sinensis var. coreana (6x). Isoetes pseudo japonica and I.× michinokuana are endemic to Japan and are characterized by both reticulate megaspores and echinate microspores. Isoetes pseudojaponica should reproduce sexually, while I.× michinokuana is a sterile, heptaploid hybrid. Isoetes sinensis var. coreana differs from var. sinensis in the larger size of its microspores. the longer length of its guard cells, and the structure of its leaves in cross section.
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HIROSHI TAKAHASHI
Article type: Article
1998 Volume 48 Issue 2 Pages
123-127
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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A new species of Tricyrtis, T. viridula, is described from south and southeast China. It is similar to Tricyrtis pilosa, T. affinis and T. setouchiensis, but the stem and the leaves are almost glabrous in contrast to the hairy ones of the latter three species. The flowers of T. viridula are rather small and the perianth has pale orange spots on the adaxial side just bellow the patent point. This species appears to have been identified with T. pilosa or T. macropoda previously.
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MICHIO WAKABAYASHI
Article type: Article
1998 Volume 48 Issue 2 Pages
129-146
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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Chrysosplenium pseudofauriei H. Lev. (series Sinica), which has been known only from the northeastern part of the Asiatic continent and Cheju-do (Quelpart Isl.), was newly found in Shikoku, Japan, isolated from the main distribution area. It was examined morphologically and cytologically, and compared with materials obtained from Korea and with herbarium specimens. The Japanese plants were recognized as a new variety of the species. This new variety, var. nipponense, is distinguished from var. pseudofauriei in having smaller rosette leaves at the tip of sterile branches after flowering, remarkably saccate calyces, the styles about half as long as the calyx lobes, smaller seeds, the constricted structure of papillae on the seed surfaces, and larger chromosomes at metaphase. The chromosome number of the species was counted as 2n=24 for the first time.
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NOBUYUKI FUKUOKA, NOBUHIRA KUROSAKI
Article type: Article
1998 Volume 48 Issue 2 Pages
147-150
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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A new species, Spatholirion decumbens, is described from Prov. Narathiwat, Peninsular Thailand. This differs from S. ornatum in some characters including its decumbent habit, ovate or elliptic leaves, and densely silky hairy petiole without sheath.
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H. O. EDEOGA, B. E. OKOLI
Article type: Article
1998 Volume 48 Issue 2 Pages
151-158
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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The anatomy of lamina, rhizome and root of three taxa of Costus was investigated with a view of establishing interrelationships among the previously confused species of the genus. Differences in features of the vegetative anatomy suggest that a separate specific status for C. afer and C. lucanusianus is justified as opposed to the conspecific treatment given to them by previous researchers. A hybrid collection of these Costus species does not merit a separate specific status, although it possessed distinct anatomical features. The systematic importance of this investigation is clear since a 3-4 layered spongy mesophyll of C. afer is different from a 4-5 layered spongy mesophyll of C. lucanusian~ and the 2-3 layers of the putative hybrid. Similarly the hexarch, nonarch and polyarch vascular bundle of the root of C. afer, C. lucanusianus and the Costus hybrid respectively, are all distinguishable attributes of these taxa that are important in systematics.
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TORU TOKUOKA, CHING-I PENG
Article type: Article
1998 Volume 48 Issue 2 Pages
159-166
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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Flowers of the species of Drypeteae in Bonin islands have been very poorly understood with respect to their morphology and structure. Both male and female flowers in flowering stage of the species from Bonin islands, as well as of the three African species of Drypetes and two East Asian species of Putranjiva (including P. matsumurae), were examined by stereoscopy and on the basis of microtome sections as well as of scanning electron micrographs. Contrary to all earlier taxonomic treatment placing the two Japanese species in the same genus, the species from Bonin islands greatly differs in floral morphology from Putranjiva matsumurae, another Japanese species in Ryukyu islands. The species from Bonin islands has the nectariferous "disk" which is lacking in Putranjiva matsumurae and has 5-8 stamens in staminate flowers in contrast to 2(-3) stamens in those of P. matsumurae. Following the latest system of classification of Euphorbiaceae, two Japanese species of Drypeteae should be placed separately in two distinct genera, i.e., the species from Bonin islands as Drypetes integerrima and, the other from Ryukyu islands as Putranjiva matsumurae. It is also shown anatomically that the disk of Drypetes is a nectary composed of small, densely stained cells with rich cytoplasm and, having stomata-like pores on surface of the adaxial side.
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KEN OYAMA
Article type: Article
1998 Volume 48 Issue 2 Pages
167-172
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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Clone structure, mortality and reproduction of two populations of a stoloniferous clonal plant, Arabis flagellosa were investigated in its northern distribution range in Japan. Vegetative spread by establishment of terminal ramets of a single stolon dominated the recruitment of both populations. Intermediate ramets in a stolon may rooted but did not survive. No surviving seedling was observed in two years. Daughter ramets were exposed to a much more mortality than mother plants. Once established, the vegetative daughter ramets are potentially stoloniferous and flowering in the next season. The two populations differed in most of the traits measured. Plants in Kibune produced longer but fewer stolons than Fujiwara-dake plants. Production of inflorescences was the most differentiated trait between the two populations. Only one plant in 1989 and four plants in 1990 produced inflorescences in Kibune. In contrast, more than 40% of plants reproduced sexually in Fujiwara-dake in both years.
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HISASHI KOKUBUN, TOSHIO ANDO, SHUJI KOHYAMA, HITOSHI WATANABE, TATSUYA ...
Article type: Article
1998 Volume 48 Issue 2 Pages
173-185
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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To clarify morphological intergradation between two subspecies of Petunia axillaris, floral morphological characters were studied on live plants grown from seeds collected from 102 localities in Uruguay. Five discriminant functions were calculated by stepwise discriminant analysis using typical individuals of the two subspecies (from 12 localities of subsp. axillaris and from 16 localities of subsp. parodii). Mean values of floral characters taken from individuals from 102 localities were substituted into these five functions to predict subspecies. Plants from some localities were predicted inconsistently or doubtfully by respective functions and were regarded as intermediate. The results confirmed our previous reports, but the distribution of the two subspecies and their intermediate forms was inferred with more detail and clarity. Two subspecies of Petunia axillads occurred separately and the border between the two taxa roughly corresponds to the Rio Negro river. The localities of intermediate forms were mostly distributed in the area parallel to the Rio Negro and on the shore of the Rio de la Plata.
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JAE-HONG PAK, NAM-CHUNG KIM, KYUNG CHOI, BONG-BO SEO, INSUN KIM, SEUNG ...
Article type: Article
1998 Volume 48 Issue 2 Pages
187-196
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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The distribution of di-, tri-, and tetraploids of the Ixeris chinensis complex in the East Asia is surveyed by determining the ploidy on the basis of pollen grain size and stainability. Diploids are restricted to Ixeris chinensis subsp. chinensis, and tri- and tetraploids to I. chinensis subsp. strigosa. In continental areas of the East Asia including Korea, all the di-, tri-, and tetraploids occur. In contrast, only diploids are found in Taiwan, while only tri- and tetraploids occur in Japan. The triploids in Japan seem likely to have migrated from the continental Asia, rather than they originated in Japan by hybridization between diploids and tetraploids, and have been distributed throughout Japan by agamic propagation.
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REIJI NOZAKI, TOMIKI KOBAYASHI, YOSHIAKI FUJIMOTO
Article type: Article
1998 Volume 48 Issue 2 Pages
197-204
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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Eulalia speciosa, a rare plant in the Poaceae of the warm-temperate zone, has been considered to be one of the 'Tokai floral elements' by various authors. In 1994, however, E. speciosa was found in the eastern Harima region, Hyogo Prefecture, Kinki district, western Japan. An intensive survey followed revealed that about 30 localities of E. speciosa populations exist in this region. A distribution map of E. speciosa in the Japanese archipelago was presented on the basis of herbarium specimens, including those from the new localities. In the eastern Harima region, E. speciosa grows in the Miscanthus-type dry grasslands formed on bald hills and on irrigation pond embankments. Nearly all localities are geologically restricted to areas with rhyolite pyroclastic rocks and lavas. The establishment of bald hills caused by fires and cutting, together with a dry climate and unique geology, may be the main factors supporting the E. speciosa populations in this region. Additionally, the establishment of a large number of small grasslands on irrigation pond embankments seems to have provided suitable refugia for E. speciosa through recent loss of grassland habitats caused by reforestation and progressive succession.
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KEN INOUE, TAKAHIRO YAGAME
Article type: Article
1998 Volume 48 Issue 2 Pages
205-
Published: February 28, 1998
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KEN INOUE
Article type: Article
1998 Volume 48 Issue 2 Pages
205-206
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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MASAHIRO SAKODA, SHINYA MIYAKE, YOU HAMANISHI, YOSHIAKI TAKEDA
Article type: Article
1998 Volume 48 Issue 2 Pages
206-209
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
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[in Japanese]
Article type: Article
1998 Volume 48 Issue 2 Pages
210-
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
JOURNAL
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[in Japanese]
Article type: Article
1998 Volume 48 Issue 2 Pages
210-
Published: February 28, 1998
Released on J-STAGE: September 25, 2017
JOURNAL
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