Panicum virgatum (Poaceae), newly naturalized in Shikoku, Japan.
Panicum virgatum L., a native of North America, is newly naturalized to Shikoku, western Japan. This grass grows on the newly constructed road sides of Man'nocircle over˜-cho, Nakatadogun, Kagawa Prefecture. This alien plant seems to have been brought by the construction of new forestry roads. To assist in the identification, diagnostic characteristics, and discrimination points of related taxa are provided.