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(First upload on January 11 2010. Last on May 6 2019) [ 日本語 | English ]

Polygonum cuspidatum Siebold et Zucc.






Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Polygonum L. (タデ)
Itadori (イタドリ, 痛取), Japanese knotweed
Lifeform: large perennial forb
Distribution: China - Taiwan - Korea - Japan (incluidng southwestern Hokkaido) [now one of '100 of the world's worst invasive alien species'] (IUCN)
Habitat: disturbed sites, such as volcanoes

Flora on Mount Usu

Seed dispersal: wind
Morphology compared to Polygonum sachalinense (オオイタドリ) and Polygonum weyrichii (ウラジロタデ)
Synonyms

Fallopia japonica (Houtt.) Ronse Decr.: standard
Polygonum cuspidatum Siebold et Zucc. f. compactum (Hook. f.) Makino

Reynoutria japonica Houtt.
Polygonum cuspidatum Siebold et Zucc. var. compactum (Hook. f.) L. H. Bailey
Reynoutria japonica Houtt. f. var. compacta (Hook. f.) Hiyama
Reynoutria japonica Houtt. f. compacta (Hook. f.) Nemoto
Fallopia japonica (Houtt. f.) Ronse Decr. var. compacta (Hook. f.) J. Bailey
Polygonum compactum Hook. f.

var. uzenense (Honda) Noda(ケイタドリ)
var. compactum (Hook. f.) L. H. Bailey (オノエイタドリ)
var. hachidyoense (Makino) Ohwi (ハチジョウイタドリ)
f. colorans (Makino) Makino (メイゲツソウ/ベニイタドリ)
Hybrid between this species and P. sachalinense (エゾイタドリ, アイイタドリ)
索引

Polygonum cuspidatum in the Northern Hemisphere


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[1/2] a patch enclosed by Polygonum sachalinense and Artemisia montana in the crater basin of Mount Usu (有珠山) on July 15 2008. [3] in the campus of Kagoshima University, southern Kyushu, on March 18 2015. [4] on Murmur (Seseragi) Forest in Oi Pier, Tokyo, on June 3 2016. [5] at a bank along Sophia Street, Chiyoda Ward, Tokyo, on November 14 2014. [6] along a paved road near a harbor in Saint John, New Brunswick, eastern Canada, on September 19 2014. [7] in the South Park of Kobe Port Island, western Japan, on March 15 2019.


var. variegatum Makino (Not accepted)

Fuiri-itadori (フイリイタドリ, 斑入痛取), Cultivars
Syn: Reynoutria japonica Houtt. f. spectabilis Houtt.

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[1-3] at Experimental Station for Medical Plant Studies, Faculty of Medicine, Hokkaido University, on October 15 2011.

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