Reynoutria japonica Houtt., Handl. Pl.-Kruidk. 8: 639 1777. (syn: Fallopia compacta (Hook.f.) G.H.Loos & P.Keil; Fallopia japonica (Houtt.) Ronse Decr. …..; Pleuropterus cuspidatus (Siebold & Zucc.) H.Gross; Pleuropterus zuccarinii (Small) Small; Polygonum compactum Hook.f.; Polygonum cuspidatum Siebold & Zucc. .; Polygonum hachidyoense Makino .; Polygonum sieboldii de Vriese ex L.H.Bailey [Illegitimate]; Polygonum zuccarinii Small; Reynoutria compacta (Hook.f.) Nakai; Reynoutria hachidyoensis (Makino) Nakai .; Reynoutria hachijoensis Nakai ex Jotani; Reynoutria hastata Nakai ex Ui; Reynoutria henryi Nakai; Reynoutria japonica var. compacta (Hook.f.) Moldenke …..; Reynoutria uzenensis (Honda) Honda; Tiniaria japonica (Houtt.) Hedberg);

Russian Far East to China and Temp. E. Asia as per POWO;

China (Anhui, Fujian, N-Gansu, Guangdong, Guangxi, Guizhou, Hainan, ?Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, ?Liaoning, N-Shaanxi, Shandong, Sichuan, Yunnan, Zhejiang), Vietnam, Taiwan, Japan (Hokkaido, Honshu, Shikoku, Kyushu), Ryukyu Isl., South Korea, North Korea, Russian Far East, Portugal (I), Spain (I), France (I), Italy (I), Montenegro (I), Bosnia & Hercegovina (I), Slovenia (I), Croatia (I), Bulgaria (I), Austria (I), Belgium (I), England (I), Czech Republic (I), Slovakia (I), Finland (I), Germany (I), Ireland (I), Switzerland (I), Netherlands (I), Hungary (I), Norway (I), Poland (I), Romania (I), N-European Russia (I), Estonia (I), Georgia [Caucasus] (I), Belarus (I), Australia (I) (New South Wales (I), Tasmania (I)), Alaska (I), USA (I) (Arkansas (I), California (I), Colorado (I), Connecticut (I), District of Columbia (I), Delaware (I), Georgia (I), Iowa (I), Idaho (I), Illinois (I), Indiana (I), Kansas (I), Kentucky (I), Louisiana (I), Massachusetts (I), Maryland (I), Maine (I), Michigan (I), Minnesota (I), Missouri (I), Mississippi (I), Montana (I), North Carolina (I), Nebraska (I), New Hampshire (I), New Jersey (I), New York (I), Ohio (I), Oklahoma (I), Oregon (I), Pennsylvania (I), Rhode Island (I), South Carolina (I), South Dakota (I), Tennessee (I), Utah (I), Virginia (I), Vermont (I), Washington State (I), Wisconsin (I), West Virginia (I)), Canada (I) (British Columbia (I), Manitoba (I), New Brunswick (I), Newfoundland (I), Nova Scotia (I), Ontario (I), Prince Edward Isl. (I), Quebec (I)) as per Catalogue of Life;


 



Reynoutria japonica from Canada-GS15022021-1

Reynoutria japonica Houtt.

Syn: Fallopia japonica (Houtt.) Ronse Decr.

Common name: Japanese Knotweed

Herbaceous perennial often reaching 3 m in height, with swollen nodes, leaves broadly ovate, up to 15 cm long and as broad with entire margin; flowers small, white in up to 15 cm long racemes.

Photographed from Japanese Park, Mississauga, Canada, 7-9-2019.


 

 

References: POWO  Catalogue of Life  The Plant List Ver.1.1  IPNI  GRIN  Wikipedia  GBIF
https://www.cabi.org/isc/datasheet/23875
https://gobotany.nativeplanttrust.org/species/fallopia/japonica/
https://www.invasiveplantatlas.org/subject.html?sub=19655
https://plants.ces.ncsu.edu/plants/reynoutria-japonica/

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