Invasion information |
Range in Japan |
Almost entire Japan. All the Prefectures of Honshu Island except Nara and Osaka; Hokkaido, Ehime, Kochi, Oita, Miyazaki, and Okinawa Prefs. |
|
Origin |
Unknown. |
Date |
Introduced to Japan in late 19 C. The first record in the field was in 1955. |
Route |
Deliberate: Ornamental plant |
Impact |
Actually: Competition with native plants. Native organism(s) affected: Native grass and shrub. Spiraea salicifolia, Salix integra, Salix udensis, Malus toringo, etc. in Senjogahara, Nikko, Tochigi Pref. |
Regulation in Japan |
Import, transport and keeping are prohibited in Japan by the Invasive Alien Species Act. |
Introduced range in other countries |
China, etc. |