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and SHIMOMURA, Takashi : Classification of Trachelospermum cultivars circulated as landscape and ornamental plants in Japan Abstract : Trachelospermum. asiaticum and T. jasminoides var. pubescens are native to Japan and used in many landscaping situations. In addition to wild species, cultivars of this genus are commercially distributed. However, the genetic relationship between cultivars and wild species is unknown and no comprehensive classification has been held regarding Trachelospermum cultivars. In this study, we compared the morphological characters of reproductive and vegetative organs between native species and 35 accessions of cultivars collected from nurseries and plant suppliers. As a result, those accessions were classified into six cultivars of adult T. asiaticum, two cultivars of juvenile T. asiaticum, two cultivars of adult T. jasminoides var. pubescens and five cultivars of juvenile T. jasminoides var. pubescens. From these results we clarified that there are some Trachelospermum cultivars given incorrect commercial names and it resulted in the confusion of their names in the green industry.