Distribution of Chrysanthemum yezoense MAEKAWA (n=45) in Honshu, Japan
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概要
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1. The present material plant is Chrysanthemum yezoense MAKKAWA (n=45), one of the decaploids in the Chrysanthemum-polyploid series. 2. The distribution of Honshu-population of the species is investigated in this paper, both horizontally and vertically. Horizontally: (1) The north limit of distribution is Omazaki, (2) the south limit of the Japan-Sea side is Wakimoto, and that of the Pacific side is Kuzi, (3) the west is Gongenzaki, and (4) the east is Todosaki. Vertically: the species appears on the hill, in the field, on the rocky coast, and on the sandy coast in the area. On Mts. Fukkoshi-Eboshi (507.8m) and Urera (625m), we are able to observe the isolated small populations of the decaploid. The great majority of the species will be found on the seacliffs. Thus the plant is one of the coast chrysanthemums in North-East Honshu, Japan. 3. The Honshu-population of the species may be divided into three: north-, middle-, and south-populations. In the underbushes of the coast forests, the field-type plants are frequently found in the south-population. 4. The overlapping distribution between Chr. yezoense and Chr. nipponicum (n=9) ranges from Hachinohe to Kuzi, but no natural inter-specific hybrid between the two has ever been obtained. Chr. Mdkinoi (n=9) and Chr. boreale (n=9) are found near the Chr. yezoense-area. But no one has ever revealed the natural hybrid between the diploids and the decaploid. Moreover the following four are examined at Mizuki: Chr. yezoense, Chr. pacificum (n=45), Chr. nipponicum, and cultivated chrysanthemums. Of course, various hybrids between them are observed on the sea-cliffs (about 100m^2) of Mizuki. Among them, are found the vigorous hybrids between Chr. yezoense and cultivated chrysanthemums. Such plants are essentially similar to those which were taxonomically named Chr. miyatojimense KITAMURA by KITAMURA (1940) and cytologically reported as 2n=72 by OKABE (1949), each of the two using the materials of Miyatozima.
- 横浜国立大学の論文
- 1956-10-05
横浜国立大学 | 論文
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