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(First upload on November 21 2008. Last on February 28 2023) [ 日本語 | English ]

Amaranthus L. (ヒユ) Aogeitou (アオゲイトウ, 青鶏頭), redroot pigweed Aobiyu (アオビユ), avoiding not to confusing with A. viridis, Aka-aobiyu (アカアオビユ) Life form: annual forb, occasionally becoming 3 m in height Origin: exotic to Japan from tropical America Habitat: widespread weed on ruderal habitats, e.g., roadsdies

Field training on integrated environmental research (統合環境調査法実習) HUSTEP: Plants and Plant communities in Japan (flora list) Flower: monoecious

Amaranthus retroflexus in Hokkaido

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[1] a roadside at East Ward (N23/E1) in the city of Sapporo on August 30 2008. [2/3] a roadside at North Ward (N18/W3) in the city of Sapporo on June 13 2010. [4/5} at a roadside in N25/E3, East Ward, Sapporo, on August 19 2016. [6] along a paved road in N21/E2, East Ward, Sapporo, on October 21 2022. Records: in front of Horokita Elementary School, North Ward, Sapporo, on September 8 2021.