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(Upload on December 24 2017) [ 日本語 | English ]

Polygonum L. (タデ) Mamakonoshirinugui (ママコノシリヌグイ, 継子尻拭), manyspiny knotweed Togesoba (トゲソバ, 刺蕎麦) Lifeform: branching, annual forb Distribution: east Asia, including the whole of Japan Habitat: roadsides, waste lands, etc. Flower: hermaphrodite (having both male and female organs) Stem: develping spines

Synonyms: Chylocalyx senticosus Meisn., basionym Persicaria senticosa (Meisn.) H. Gross, when established ths genus Truellum japonicum Houtt. Persicaria senticosa (Meisn.) H. Gross var. inermis Sugim. (トゲナシママコノシリヌグイ), no spines f. albiflora (Honda) Honda (シロバナトゲソバ), white flower

Polygonum senticosum in Hokkaido

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[1-3] along a seacoast on the bottom of cliff near the Muroran Marine Experimental Station of Hokkaido University on September 11 2017.