Morphological and Molecular Studies of Natural Hybridization between Trachelospermum asiaticum and Trachelospermum jasminoides (Apocynaceae) in Japan

cludes a number of evergreen, woody lianas distributed in southern and eastern Asia, with one species in southeastern North America (Murata 1989, Jussieu 1995). The species are widely used as ornamental or landscape plants around the world (Brickell 1996) and are also used in Chinese herbal medicine (Nishibe et al. 2002). Three species are recognized in the Japanese archipelago (Yamazaki 1993). Trachelospermum gracilipes Hook. f. var. liukiuense (Hatus.) Kitam. is restricted to the Bonin (Ogasawara) Islands and Nansei Islands southward from Yakushima (Yamazaki 1993). Trachelospermum asiaticum (Siebold et Zucc.) Nakai occurs westward from Iwate Prefecture, and T. jasminoides (Lindl.) Lem. occurs westward from the Kinki district. Therefore, the distribution areas of T. asiaticum and T. jasminoides largely overlap in western Honshu, Shikoku and Kyushu. In China, both T. asiaticum and T. jasminoides are widely distributed in central and southern regions of the country (Jussieu 1995). However, because T. gracilipes and T. asiaticum are not discriminated from each other in China (Jussieu 1995) and in Taiwan (Li & Huang 1998), the distribution area of T. asiaticum is unclear. Trachelospermum jasminoides in Japan has hirsute leaves and flowers, and has been separated as var. pubescens Makino from var. jasminoides, which occurs in China and Taiwan and has glabrous or less hirsute leaves and flowers (Hatsusima 1940, Ohwi 1965, Kitamura & Murata 1971, Murata 1989, Uemachi & Shimomura 2007, 2008). Yamazaki (1993), however, suggested that T. jasminoides var. pubescens is not distinct from var. jasminoides. In areas where Trachelospermum asiaticum and T. jasminoides occur together, plants that combine their morphological characteristics have been found and the possibility of hybridization between them has been implied. A previous molecular study using nuclear internal transcribed Morphological and Molecular Studies of Natural Hybridization between Trachelospermum asiaticum and Trachelospermum jasminoides

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