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(First upload on January 11 2010. Last on October 16 2023) [ 日本語 | English ]

Polygonum L. (タデ) Itadori (イタドリ, 痛取/虎杖), 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 P. sachalinense (オオイタドリ) and P. 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) Distribution: Izu Islands Leaf: thick and glossy

f. colorans (Makino) Makino (メイゲツソウ/ベニイタドリ)

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. [8] on the southern crater basin of Mount Usu on September 19 2020.

var. hachidyoense (Makino) Ohwi (ハチジョウイタドリ)

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[1-3] between the middle and top of Mount Mihara, Izu-Oshima Island (伊豆大島), on June 7 2023.

f. colorans (Makino) Makino (ベニイタドリ)

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[1-3] on the southern crater basin of Mount Usu on September 19 2020.

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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] in Experimental Station for Medical Plant Studies, Faculty of Medicine, Hokkaido University, on October 15 2011.