What are invasive alien species? You may visit the websites of invasive species and introduced species:
https://www.pref.yamanashi.jp.e.aao.hp.transer.com/shizen/nagaeturunogeitou.html
https://www.env.go.jp/nature/intro/2outline/files/siteisyu_list_e.pdf
https://environment.ec.europa.eu/topics/nature-and-biodiversity/invasive-alien-species_en
https://en.wikipedia.org/wiki/Introduced_species
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/introduced-species
https://en.wikipedia.org/wiki/List_of_introduced_species
Six major notorious plant invasive alien species have been reported in Yamanashi Prefecture:
1. Lanceleaf coreopsis (Coreopsis lanceolata)
https://en.wikipedia.org/wiki/Coreopsis_lanceolata
https://www.town.aichi-higashiura.lg.jp/material/files/group/34/ookinnkeigikunomiwakekata.pdf
https://www.nies.go.jp/biodiversity/invasive/DB/detail/80490e.html
Also, please read the article “Invasive Plants: Lance-leaved tickseed and Kudzu” on June 08, 2022: https://etsuo.tokyo/2022/06/ and “Summery Day! And Lance-Leaved Tickseed” on May 18, 2022: https://etsuo.tokyo/2022/05/
2. Oneseed bur cucumber (Sicyos angulatus)
https://en.wikipedia.org/wiki/Sicyos_angulatus
https://www.nies.go.jp/biodiversity/invasive/DB/detail/80220e.html
https://mikawanoyasou.org/data/aretiuri.htm
3. Long-headed poppy (Papaver dubium)
https://en.wikipedia.org/wiki/Papaver_dubium
https://www.nies.go.jp/biodiversity/invasive/DB/detail/80080e.html
https://mikawanoyasou.org/data/nagamihinagesi.htm
4. Tall Golden rod (Solidago altissima)
https://en.wikipedia.org/wiki/Solidago_altissima
https://mikawanoyasou.org/data/seitakaawadatisou.htm
https://www.nies.go.jp/biodiversity/invasive/DB/detail/80600e.html
Also, please read the article “Roadside Plants in Nakano, Nagano” on October 22, 2023: https://yamanashietsuo.net/2023/10/.
5. Cutleaf coneflower (Rudbeckia laciniata)
https://www.nies.go.jp/biodiversity/invasive/DB/detail/80580e.html
https://mikawanoyasou.org/data/oohangonsou.htm
https://www.jstage.jst.go.jp/article/hozen/12/2/12_KJ00004784742/_article/-char/en
6. Alligator weed (Alternanthera philoxeroides)
https://www.nies.go.jp/biodiversity/invasive/DB/detail/81140e.html
https://en.wikipedia.org/wiki/Alternanthera_philoxeroides
https://www.city.saga.lg.jp/site_files/file/usefiles/downloads/11812_20140226051621.pdf