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(First upload on February 17 2010. Last on January 17 2019) [ 日本語 | English ]

Polygonum L. (タデ) Haimichiyanagi (ハイミチヤナギ, 這道柳), oval-leaf knotweed Kogomemichiyanagi (コゴメミチヤナギ) Lifeform: weedy, summmer-annual forb Distribution: widespread in the northern hemisphere (exotic to Japan) Hokkaido Blue List: A3

Habitat: common on roadsides and open fields HUSTEP: Plants and Plant communities in Japan (flora list) Synonyms: Polygonum aequale Lindm. ☛ Polygonum aviculare L. (ミチヤナギ) var. arenastrum (Jord. ex Boreau) Rouy, often used

Polygonum arenastrum in Hokkaido

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1 2 3
4 5 6
[1/2] in N28/E4, East Ward, on August 30 2009. [3] in an openland along Ishikari Coast, where a wind power will be established, on September 3 2015. [4/5] on a paved road in N28/E2, East Ward, Sapporo, on October 1 2018. [6] on an unpaved parking lot, N26/E2, East Ward, Sapporo, on August 19 2016. Record: at a wasteland in N28/E4, East Ward, on August 30 2009; in the former sport ground of an elementary school in the city of Muroran on September 14 2015. The school was closed in the last year. On a wasteland in N15/W4, North Ward, Sapporo, on October 28 2020.