I am enjoying reading this excellent book about Japanese Morning Glory, titled "Japanese Morning Glories II - From Seedling to Flowering", published in 2000 by the National Museum of Japanese History (NMJH) [ISBN 4-916202-31-7]. It is a nearly 80 page compilation of information presented in an exhibition held at the museum August 1 - September 3, 2000. A brief description of the exhibition may be found on this web site: www.rekihaku.ac.jp/english/exhibitions/project/o000801_02...
There are three main chapters, which are as follows:
Chapter I (Written by Eiji Nitasaka, Ph.D., Assistant Professor, Faculty of Science, Kyushu University)
--From Seedling to Flowering of Major Strains
--What are Mutant Japanese Morning Glories?
--The Seedless Demono-type Strains
Chapter II (Written by Reiji Iwabuchi, History Department, NMJH)
--Cultivation Methods in the Edo Period
Chapter III (Written by Hiromi Kobayashi, Horticultural Researcher, Chiba Prefectural Boso-no-mura Museum, Jukichirou Watanabe,History Department, NMJH, and Yoshihide Kitai, Horticultural Researcher, NMJH)
This book was presented to me as a gift. I presume it is available in Japan at the museum.