1987 年 107 巻 3 号 p. 227-232
The essential oils of about fifty species of wild-gingers in Japan and in neighboring countries have been investigated, and the essential oils are divided into three types as shown in Table I. Namely, the first type is a primitive type characterized by containing many kinds of minor mono- or sesquiterpenoids ; the second one is an intermediate type containing several phenylpropanoids as major components ; the third one is an advanced type characterized by containing propanoids as a major component together with trace amounts of other constituents. A character of each essential oil is related to the taxonomical position of each original plant among groups to which they belong. Therefore, the data of each essential oil afford some significant informations in order to deduce the mutual phylogenical relationship. However, the systematic tree of wild-gingers (Asarum, wide sensed) has not been figured out such ambiguous problems as the existence of many ancestral kinds growing in China, Taiwan and Ryukyu.