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(Last upload on January 17 2013. Last on August 21 2020) [ 日本語 | English ]

Hypericum L. (オトギリソウ) Ookanadaogiri (オオカナダオトギリ, 大加奈陀弟切), large (Canadian) St. John's wort Lifeform: annual/short-lived perennial forb with short leafy rhizomes Distribution: central and northern North America (exotic to Japan) firstly reported from Mukawa Town, Hokkaido in 1965 (Shimizu 1977) Habitat: roadsides (establishing facultatively in wetlands, as in the native regions)

Flower: smaller petals than the other Hypericum species < 7 mm long Synonyms: Sarothra major (A. Gray) Y. Kimura

Hypericum perforatum in Hokkaido

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[1/2] at a raodside, N27/E2, East Ward, Sapporo, on Auust 31 2012. [3-5] on a sandbar near Kariki Bridge along Toyohira River, Sapporo, on July 14 2020.