(First upload on December 16 2008. Last on October 6 2021) [ 日本語 | English ]

Lythrum salicaria L.

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

Lythrum L. in Japan

Probably 38 species consisting of annuals and perennials
L. anceps (Koehne) Makino (ミソハギ): native to Japan, but not originally in Hokkaido
L. californicum Torr. et A.Gray (アメリカミソハギ): exotic to Japan (not reported from Hokkaido)
L. hyssopifolia L. (コメバミソハギ): exotic to Japan (not reported from Hokkaido)
L. salicaria L. (エゾミソハギ)

Lythrum salicaria in Hokkaido

Ezomisohagi (エゾミソハギ, 蝦夷禊萩), purple loosestrife
Lifeform: clonal, perennial forb, with 50-150 cm in height
Distribution: native to Europe, Asia, northwest Africa, and southeastern Australia
Habitat: shallow freshwater, marsh and fen ⇒ wetland (湿原)

established in the 4th crater and Yu-kun crater on Mount Usu (flora)

Leaf: adverse
f. glabrum (Ledeb.) Köhne (ケナシエゾミソハギ)

[1] in Sarobetsu Mire, northern Hokkaido, on August 20 1989. [2/3] in Abira wetland, central Hokkaido, on July 16 2012. [4] in Ono Pond (大野池), HU, on August 31 2012. [5] in Koshimizu Natural Flower Garden, eastern Hokkaido, on August 30 2020. [6] in Sosei River near N10/E1, North Ward, Sapporo, on September 10 2021. Records: along a paved road in front of the Toya Lake Experimental Station of Hokkaido University on September 4 2018.

Mount Usu

[1] adjacent to a erosion prevention dam near Yu-kun Crater (K-1) on August 17 2018.