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(First upload on September 15 2008. Last on August 28 2023) [ 日本語 | English ]

Lactuca L. (アキノノゲシ) Togechisya (トゲチシャ, 刺萬苣), prickly lettuce Life form: annual - biennial forb Distribution: widespread weed in cool to tropical regions (exotic to Japan) Habitat: sunny sites, e.g., crop field, waste ground, roadside verge Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト) Chromosome number: 2n = 18

________________Achene Synonyms: Lactuca serriola L., the standard f. integrifolia (Bogenh.) G. Beck. (マルバトゲチシャ) Leaf: non-laciniated Leaf: sometimes spine-less

Lactuca scariola in Hokkaido

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1 2 3
4 5 6
[1/2] at N25/W1, North Ward, Sapporo, on July 28. [3] at a roadside in N28/E2, East Ward, Sapporo, on August 21 2018. [4] at N15/W1, North Ward, Sapporo, on July 19 2017. [5] at MAX PSU South Station, Portland, Oregon, on August 8 2017. [6] along a paved road in N28/E2, East Ward, Sapporo, on July 14 2020. Discard: in a parking lot along a radoside, West Ward, Sapporo, on August 30 2008.

f. integrifolia (マルバトゲチシャ)

1 2
[1] at N25/W1, North Ward, Sapporo, on August 1 2011. This species has dimorphic leaves. [2] a spine-less leaf beside Atsuma River Bridge, Atsuma Town, on August 5 2022.