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(First upload on October 30 2013. Last on February 21 2023) [ 日本語 | English ]

Polygonum L. (タデ) O-oinutade (オオイヌタデ, 大犬蓼), curlytop knotweed Lifeform: large annual forb < 2 m in height Distribution: widespread in the northern hemisphere, including Japan Habitat: roadsides, open lands, etc. Flower: white - pale pink Synonyms: Persicaria lapathifolia (L.) Delarbre var. lapathifolia Persicaria lapathifolia (L.) Gray subsp. nodosa (Pers.) A. Love

Persicaria nodosa (Pers.) Opiz Persicaria tenuiflora (Pers.) H. Hara Polygonum komarovii H. Lev. Polygonum lapathifolium L. ssp. nodosum (Pers.) Fr. Polygonum nodosum Pers. Different taxonomy Persicaria lapathifolia (L.) Delarbre var. lapathifolia (オオイヌタデ) var. incana (Roth) H. Hara (サナエタデ) var. lanata (Roxb.) H. Hara (キヌタデ)

Polygonum lapathifolium in Hokkaido

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[1] beside an artificial pond in front of Sarobetsu Wetland Center, northern Hokkaido, on August 29 2021. [2/3] at a roadside, N10/W1, North Ward, Sapporo, on September 4 2013. [4] along an unpaved road near Zenibako Coast, where wind-power farm is established, near Sapporo on September 16 2020. [5/6] in an openland, N13/W4, North Ward, Sapporo, on November 21 2018. [7-9] in a waste land on N25/W3, North Ward, Sapporo, on October 6 2022. Records: on a trail adjacent to Toyonaka Park along Shojin River, Sapporo, on September 18 2021. Escaped shoots growing pink flowers within a flower garden in N25/E1, East Ward, Sapporo, on October 9 2021.