Acta Phytotaxonomica et Geobotanica
Online ISSN : 2189-7050
Print ISSN : 0001-6799
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Volume 51, Issue 2
Displaying 1-12 of 12 articles from this issue
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  • Naraveliocarpa, a New Section of Clematis (Ranunculaceae) from Thailand
    MICHIO TAMURA
    Article type: Article
    2001 Volume 51 Issue 2 Pages 127-131
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077461
    JOURNAL FREE ACCESS
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    A new section of Clematis (Ranunculaceae), sect. Naraveliocarpa, is described based on Naravelia eichleri Tamura from Thailand.
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  • The Identity of Veratrum chiengdaoense (Melanthiaceae) and A New Record of V. mengtzeanum from Thailand
    NORIYUKI TANAKA
    Article type: Article
    2001 Volume 51 Issue 2 Pages 133-137
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077462
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    Veratrum chiengdaoense K.Larsen from northern Thailand is treated as a synonym of V. mengtzeanum O.Loes. from Yunnan, China, since there is no significant difference between them. Veratrum mengtzeanum is recorded for the first time from Thailand. This species seems closely allied to V. virginicum (L.) Aiton and V. latifolium (Desr.) Zomlefer indigenous to eastern North America, as they share clawed tepals with a pair of prominent nectaries.
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  • Morphological and Cytological Variation and Infraspecific Taxa in Arenaria merckioides (Caryophyllaceae)
    TAKASHI SUGAWARAI, YUJIRO HORII
    Article type: Article
    2001 Volume 51 Issue 2 Pages 139-146
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077463
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    Morphological and cytological variation in Arenaria merckioides, a gynodioecious species restricted to a limited area of northern Honshu and eastern Hokkaido, Japan, was studied to determine whether infraspecific taxa can be recognized. Population analyses indicate that morphological variation in previously accepted diagnostic characters of flowers and leaves are largely continuous in the three populations examined at Mt. Chokai, Meakan-dake and Rausu-dake, and that some characteristics of the flowers differ statistically between hermaphrodite and female plants in each population. Sexual dimorphism in the flowers was found in natural populations in eastern Hokkaido and in northern Honshu. All the individuals examined had 2n=136, probably an octoploid of x=17. Comparing the hermaphrodite and female flowers respectively among the populations, the Chokai population was separable from the Meakan and Rausu populations by having longer sepals and showing a lower value of length of petal to sepal ratio. The differences in morphological variation between the populations support the recognition of two infraspecific taxa, var. merckioides and var. chokaiensis.
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  • Karyotype Analysis of Two Species of the Chinese Epiphytic Genus Heteropolygonatum (Convallariaceae-Polygonateae)
    JUN YAMASHITA, MINORU N. TAMURA
    Article type: Article
    2001 Volume 51 Issue 2 Pages 147-153
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077464
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    Heteropolygonatum xui and H. ogisui were karyologically investigated for the first time. H. xui was found to be diploid with 2n=32 and H. ogisui was tetraploid with 2n=64, a new count for the genus. At the present stage, all species of the genus except H. ginfushanicum, i.e. H. roseolum, H. pendulum, H. xui and H. ogisui, were karyologically revealed, and all of the four species have the same basic chromosome number of x=16. Accordingly, the genus Heteropolygonatum may be uniform in basic chromosome number. It is also confirmed that the basic chromosome number is one of the characters available for distinguishing Heteropolygonatum from Polygonatum.
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  • A Quantitative Comparison of Distribution Patterns in Four Common Sparganium Species in Yakutia, Eastern Siberia
    HIDEKI TAKAHASHI, KONSTANTIN A. VOLOTOVSKYI, TOSHIYUKI SATO
    Article type: Article
    2001 Volume 51 Issue 2 Pages 155-167
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077465
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    Distribution of Sparganium in Siberia has not been well understood because of scant information on the relevant herbarium specimens and the limited circulation of Russian botanical publications. This paper accurately describes and quantitatively analyzes the distribution patterns of four common Sparganium species in Yakutia, eastern Siberia based on field work, herbarium specimens, and the literature. Sparganium emersum and S. hyperboreum are the two most dominant species of all the Yakutian Sparganium. The distribution of the former is concentrated in the central lowland, especially the middle channel of the Lena basin. The latter is widely dispersed in several river systems and occurs more to the north. These two species show a clear contrast in their geographical distribution patterns in Yakutia. Distribution of S. emersum correlates with high mean temperature in July, while S. hyperboreum occurs in areas with low mean July temperature. The former species often grows in eutrophic habitats and the latter in oligotrophic ones. The conclusion that these two dominant Sparganium species prefer different habitats, characterized by different climatic and aquatic factors, leads to the species' possible use as biological indicators of different aquatic habitats in the boreal zone.
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  • Distribution of Two Taxa in Vaccinium oxycoccus sensu lato (Ericaceae) along Micro-scale Environmental Gradients in Bekanbeushi Peatland, Northern Japan
    TARO ASADA
    Article type: Article
    2001 Volume 51 Issue 2 Pages 169-176
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077466
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    Distribution of the two taxonomic groups in Vaccinium oxycoccus sensu lato, V. oxycoccus sensu stricto and V. microcarpum, overlaps geographically, forming a sympatric field. Habitat segregation of the two types along micro-scale environmental gradients was studied in Bekanbeushi peatland, northern Japan. V. oxycoccus s.s., which has pubescent pedicels and larger leaves, occupies wetter zones with shallower groundwater tables, higher groundwater pH, and higher groundwater conductivity along the environmental gradients. V. microcarpum, which has glabrous pedicels and smaller leaves, occupies drier zones with deeper groundwater tables, lower pH, and lower conductivity. Distribution ranges of V. oxycoccus s.s. along groundwater chemistry gradients are much broader than V. microcarpum. Distribution of the two types is neighboringly sympatric rather than biotically sympatric in terms of micro-scale environmental gradients.
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  • Karyological Studies on Some Rheophytic Aroids (Araceae) in the Malesian Wet Tropics.
    HIROSHI OKADA
    Article type: Article
    2001 Volume 51 Issue 2 Pages 177-186
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077467
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    Karyological analyses were carried out on 31 species in 8 genera of rheophytes and 3 species of non-rheophytic Araceae collected in the Malesian wet tropics. Thirty of 31 rheophytic species were diploid. Rheophytic aroids have specialized into the rheophytic zones at a diploid level. There were two representative karyotypes in the tribe Schismatoglottideae, i.e., one with a largest metacentric chromosome pair and the others without. The genus Schismatoglottis can be divided into at least two groups karyologically. Most of the species of Schismatoglottis in the Malay Peninsula and Borneo have large metacentric chromosome pairs. The rheophytic genera of Schismatoglottideae, i.e., Aridarum, Bucephalandra, Hottarum and Piptospatha, also have karyotypes similar to the karyotype of Schismatoglottis and may be derived from the common ancestral stock of Schismatoglottis. The Sumatran rheophytic S. okadae and the Malayan S. brevipes, however, do not have such chromosomes and may be from a different lineage than the Bornean Schismatoglottis.
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  • Classification of Two Phragmites Species, P. australis and P. japonica, in the Lake Biwa-Yodo River System, Japan
    JUN ISHII, YASURO KADONO
    Article type: Article
    2001 Volume 51 Issue 2 Pages 187-201
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077468
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    The classification of Phragmites australis (Cav.) Trin. ex Steud. and P. japonica Steud. was reinvestigated using 19 populations from Lake Biwa and Yodo River system, based on principal components analysis of morphological data, phenological observations and chromosome studies. The two species proved to be two distinct taxa, which can be distinguished by characters of the inflorescences, culms and leaves. Hybridization of the two species was improbable because of their temporal reproductive isolation. Ploidy levels were 2n=96 (8x) and 120 (10x) for P. australis and 2n=48 (4x) for P. japonica with x=12. The intermediate forms between P. australis and P. japonica, which had been reported previously, are considered to be variants of one or the other species that show extreme variations in some characters.
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  • Taxonomy and Distribution of Weedy Taxa of Chamaesyce S.F. Gray (Euphorbiateae) in Japan.
    TAKAHIDE KUROSAWA
    Article type: Article
    2001 Volume 51 Issue 2 Pages 203-229
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077469
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    Nine species and one form of weedy Chamaesyce, i.e. C. hirta (L.) Millsp., C. hirta f. glaberrima (Koidz.) Hurus., C. makinoi (Hayata) H. Hara, C. humifusa (Willd. ex D. F. K. Schltdl.) Prokh., C. nutans (Lag.) Small, C. hyssopifolia (L.) Small, C. bifida (Hook. & Arn.) T. Kuros., comb. nov., C. prostrata (Aiton) Small, C. maculata (L.) Small, and C. thymifolia (L.) Millsp., are recognized in Japan. The various names applied to each of the species are reviewed. The changes of occurrence of each species in and after the modern age in Japan are also presented. Judging from the dates and locality of early collections, C. makinoi, C. nutans, C. hyssopifolia, C. prostrata, and C. maculata are considered to be introduced and naturalized to Japan since the end of the Edo era (1600-1868).
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  • Convolvulus althaeoides L., a new alien bindweed found in Awaji Island, Hyogo Prefecture, Japan
    SHUJI UYEMURA, MITSUO MIZUTA, TOHRU FUJIHIRA
    Article type: Article
    2001 Volume 51 Issue 2 Pages 231-234
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077470
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  • Carex leavenworthii Dewey (Cyperaceae), newly naturalized in Japan
    TERUO KATSUYAMA, HIDEYUKI NAKAZATO
    Article type: Article
    2001 Volume 51 Issue 2 Pages 234-236
    Published: April 02, 2001
    Released on J-STAGE: September 25, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077471
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  • [title in Japanese]
    Article type: Index
    2001 Volume 51 Issue 2 Pages 237-
    Published: April 02, 2001
    Released on J-STAGE: November 17, 2017
    DOIhttps://doi.org/10.18942/bunruichiri.KJ00001077472
    JOURNAL FREE ACCESS
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