While I am not a practicioner of Kampo and cannot judge his portrayal of that system, Rister has written an excellent book for those trying to bridge their understanding of Asian and western herbal databases. My favorite part is the materia medica of 157 herbs and medicinal substances, organized by English common name, with Japanese names in parentheses and an appendix with Chinese, Korean, pharmaceutical and botanical Latin names and additional identification and dosage data. The English name is frequently the Chinese or Latin name if that is the prevalent usage. Alternate names are indexed within the materia medica's alphabetical listing with references to the proper heading. Up to date research on the herbs is presented in clear English, combining new knowledge with traditional uses.
Extensive references are in an appendix.
I spent several hours cross referencing this book with Bensky's Materia Medica and added as much from one book as to the other. The Kampo book tends not to include animal products used in Chinese medicine, as well as herbs used primarily in external application or against parasites, which accounts for its smaller database. But it includes the most important herbs used in Chinese and Japanese medicine. The book is not organized by Chinese medicinal categories, although functions and indications are described in the text. It does not have a list of tastes, temperatures and channels, but parts of the body affected and organoleptic qualities are included in the text.