60 Studies of Inlieritance in the Japanese Convolvulus 



Introduction. 



The Japanese Convolvulus, closely related to the Morning Glory of 

 the Americans and known under the popular name " Asagao\" is very 

 extensively cultivated here since immemorial time as an ornamental 

 plant, and contains an abundant number of races which are characterised 

 by remarkable variation in the form and colour of leaves as well as 

 flowers. As I have been studying the hereditary behaviour of several 

 characters in this species for some years, and have reached definite con- 

 clusions in some respects, I am going to publish here the results of these 

 investigations. All experiments contained in this paper were conducted 

 in my garden in Yokohama. 



The inheritance of the Japanese Convolvulus has already been studied 

 by three authors, Tanaka^, Toyama^ and Takezakil Of these I will 

 speak below only about the investigations of Takezaki, some of whose 



Corolla with "hukurin," seen from above. 



1 This plant has been variously called by our systematists Ipomoea hederaeea, Pharhitis 

 hederacea, P. Nil, etc., and I am not able to decide myself which name is really the 

 right one. 



2 Idengaku Kyokivasyo (A text-book of Genetics in Japanese), Tokyo, 1915, pp. 32 ff. 

 and96ff. 



3 Nippon Ikusyugakukicai Kicailio (Journal of the Japanese Breeders' Association), 

 I. 1, 1916, pp. 8, 9. 



4 Ditto, pp. 12, 13 with many tables. 



