(Upload on August 17 2018) [ 日本語 | English ]

Oenothera perennis L.

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Oenothera L. (マツヨイグサ)
Hinamatsuyoigusa (ヒナマツヨイグサ, 雛待宵草), little evening primrose ,little sundrops ,perennial sundrops, or small sundrops
Lifeform: biennial/perennial forb
Distribution: native to the North America (eastern USA and Canada)

reported from the whole of Japan, now seen in Hokkaido and Honshu
Hokkaido Blue List: B, firstly reported from Hokkaido in 1996 by Asai

Habitat: escaped from gardening (sand prairies, gravel prairies, sandy savannas and open woodlands, and abandoned sandy fields in the original regions)
var. rectipilis (S. F. Blake) S. F. Blake (ケヒナマツヨイグサ)

Oenothera perennis in Hokkaido

[1] in an area for establishing a thermal power plant on the Okotsu District (興津) of Kushiro City, western Hokkaido, on September 26 2017.