(Last upload on January 17 2013. Last on August 21 2020) [ 日本語 | English ]
Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily
HOME > Plant list (植物リスト) > Hypericaceae (オトギリソウ科) > Hypericum majus
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 wortLifeform: 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 |
|
1
2
3
4
5
[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.