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(First upload on November 27 2015. Last on February 25 2018) [ 日本語 | English ]

Polygonum L. (タデ) P. sagittatum L. (アキノウナギツカミ, s.l.) arrowleaf tearthumb Synonyms: Persicaria sagittata (L.) Gross., when Persicaria is establshed var. sieboldi (Meisn.) Maxim. Akinounagitsukami (アキノウナギツカミ, 秋之鰻掴), arrowleaf tearthumb Lifeform: annual forb

Distribution: China - Siberia - Korea - Japan Habitat: margins of open water Chromosome number: 2n = 34 or 40 Synonyms: Polygonum sieboldi Meisn. var. sagittatum, eastern North America var. aestivum Makino (ウナギツカミ) (北村他 1961)

Polygonum sagittatum in Hokkaido

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[1] at a margin of pond biside a building in Tomakomai Experimental Forest September 14 2017. [2-4] adjacent to a pond in Tsukiura Forest Park (月浦森林公園) faced to Toya Lake on September 15 2015. [5/6] in the Sapporo City Nature Education Park on September 19 2016. Records: in Shibetsu wetland, eastern Hokkaido, on Augsut 28 2020. Many seedlings along Atsuma Coast (浜厚真), central Hokkaido, on June 16 2020.