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        • 밝혀지는 植物資源(Ⅵ)

          李昌福 서울大學校 農業生命科學大學 附屬樹木園 1978 서울大學校 樹木園 硏究報告 Vol.- No.2

          The author collected Apocynum sibiricum Jaquin from the top of a sand piles in the midst of the Han River, near Yoido, Seoul, which is a new addition to our flora. Apocynum lancifolium is the only taxon known so far of the same genus in Korea. It seems to be infiltrated through the United States of America where it has long been planted as an ornamental source. It fruits nicely and seems to like sandy site along the river. Lasianthus japonicus was found from the southern foot ot the Mt. Halla by Mr. J. D. Park, which is a new genus to our flora. It is very similar to the member of the genus Damnacanthus except thornless twing, 5-merous flower parts, sky blue frutit, and smoothed root. From the same locality mentioned above, Vaccinium bracteatum var. lanceolatum Nakai was found, which locality has not been known so far for us in Korea. A new form of Lespedeza cyrtobotrya for. alba has been produced during cultivation of for. semialba at our arboretum, type tree of which was transplanted from kangwondo in 1965. The seed of for. semialba produced pure white and semiwhite though it has been very difficult to find pure white forms in the field. Morphological appearance is not different from the basic species or other forms. Ambrosia trifida L. infiltrated to the western part of the Demilitarized Zone while it's form for. integrifolia Fernald was found near Chooncheon, Kangwon-do. The author found Platycodon grandiflorum for. duplex Makino from the sumit of the Mt. Joge. and Quercus dentaat for. pinnatiloba Rehder from a small island. "Nangsae Island". Cheollipo, Choongcheongnam-do during 1976 and 1977. The latter taxon was an addition to our flora. A new taxon, youngia denticulata var. alpina was disclosed from the volcanic basin of the Mt. Halla. It appears to be very similar to Y. sonchifolia but much branched and deminished, which height when fruiting attains 5∼12 cm. leaves are similar to the basic species except incised margin wiht reflexed edges. Since a new taxon, Youngia koidzumiana Kitamura was named it brought much confusion with Y. chelidoniifolia. In the fall of 1976 the author noticed many intermediate forms of Y. chelidoniifolia and Y. denticulata for. pinnatipartita, some of those approach to the former species and some to the latter taxon. Y. koidzumiana was named to that of intermediate form. Thereforse it will hard to stand as a distince species but a hybrid. It grows at the Mts. Jiri, Dokyu as well as in the area of Kwanngnung, Kyunggi-do. Ulmus macrocatpa was thought to be very hard to get germinated since I collected it at first from a southern limit, Lake paroho, Kangwondo on the 24th May 1966. Fortunately it fruited well and germinated perfectly at the our arboretum. Therefore brought a doubt on the U. macrophylla Nakai while our observations continued on it. According to the original description of U. macrophylla, Nakai had not chanced to see any fruit of it while late. T. H. Chung illustrated it's samara in his Flora Koreana though he also mentioned no flowers seen. Therefore it seems to be the illustration ofsamara came from his imagination. On the other hand U. macrocarpa collected from the Lake Paroho does not go with descriptions known so far. It differs especially not only size of the leaves on the sterile shoot but also even those of fruiting brasnches, such as they are much larger than those known. I have not chanced to read original descripton or to see type specimen of it, the specimens collected fron the Lake Paroho must put under the name of U. macrophylla. From the results made through our observation the latter is nothing different from U. macrocarpa except larger size of the leaf as well as slightly larger size of the samara, such as 2∼3 cm long instead of 2∼2.5cm long known. Therefore U? macrophylla will hard to stand as a species level but as its variety though it requires through study in compare with typical U. macrocarpa. Ulmus macrocarpa var. macrophylla, grad, nov. Ulmus macrophylla Nakai, FI. Sylv, Kor. 19, 15(1932) et Synopt. Sketch Kor. Fl. 42(1952); Uyeki, Woody PI. 23(1940); Kawamoto, Ill. For. PI. 164(1943); T. Lee. Arb. Kor 60(1947), Ill. Woody PI. (1969) et Bull. Kwanak Arb. no. 1,23(1976) ; T. Chung, Kor, FI. 1, 119 f. 238 (1957). Lespedeza cyrtobotrya for. alba, for. nov. Flora alba cetera ut typica Typus; no. 1761-1, Herb. Coll. Agr. S.N.U. Youngia denticulata var. alpina, var. nov. Similat in forma cum Y. sonchifolia et Y. denticulata sed rededit a priori multo minor, capitula nutantis, achenia latiora et breve rostrata, posteriori folia incisa mit mucronulato-dentata. Herba biennis, caulis 5∼12cm altus, ramosus, ramis divaricato-ascendentibus, Folia radicalia sub anthesi viva aut semiemarcida, oblonga, margine incisa et mucronulatodentata, leviter revoluta. Folia caulina 3.5cm longa, plus minus 1cm lata, margine irregulariter incisa et revoluta, basi semi-amplesicaulia, supra viridia scabra. Involucrum calculatum, anguste tubulosum, 6mm longum, medio 2mm latum in sicco. Squamae biseriales, exteerioles 4∼6 in numero, 0.5mm longae, interioles 8 in numero, 6mm longae, glabrae basi incrasato-carinata. Achenia nigra fusiformia 11∼12 in numero, 3mm longa, 0.7mm lata basi contracta apice brevirostra. longitudinaliter 10 costulata, costis leviter inaequalibus minute setulosa. Papus albus vel albescens, 3mm longus, setis sigilatim caducis minute scabris ceteera ut typica. Typus ; 3626-1, Herb. Coll. Agr. S.N.U Youngia x koidzumiana Kitamura, st. nov. Youngia koidzumiana Kitamura, Acta Phytot-Geobot. 11, 127 (1942), pro species ; T. Lee, Bull. Kwanak Arb. no. 1, 107(1976).

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