Abstract
In Japan, Aristolochia kaempferi Willd. and A. shimadae Hayata (= A. onoei Franch. & Sav. ex Koidz.) are often confused by the identification based on a leaf shape. The leaf morphology of the two species show large variation within an individual and within a species, and the variation is continuous between these species. Due to misidentification of the species, their geographical distribution has been incorrectly grasped. However, the species are clearly distinguished based on a floral morphology. The aims of this paper are to verify the taxonomic history of A. kaempferi group in Japan and to share the correct identification and geographical distribution for A. kaempferi and A. shimadae.
