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(First upload on December 21 2007. Last on August 27 2019) [ 日本語 | English ]

Ledum L. (イソツツジ), labrador tea L. palustre L. s.l., one species in Japan Lifeform: evergreen shurb Habitat: sunny sites, such as volcanoes (火山) and wetlands (湿原) Flora on Mount Koma ssp. diversipilosum (Nakai) Hara var. nipponicum Nakai (Iso-tsutsuji, イソツツジ, 磯躑躅), Labrador tea Distribution: northern Honshu - Hokkaido - Kuriles - Sakhalin Synonyms: Rhododendron diversipilosum (Nakai) Harmaja - ssp. diversipilosum (Nakai) Hara var. nipponicum Nakai

ssp. diversipilosum (Nakai) Hara var. diversipilosum (エゾイソツツジ/カラフトイソツツジ) Synonyms: Ledum palustre L. var. diversipilosum Nakai ssp. palustre var. decumbens Ait. (ヒメイソツツジ/ホソバイソツツジ) Distribution: eastern Siberia - Canada (including Mounts Daisetsu and Mount Kitami-Murii in Hokkaido, Japan) Synonyms: L. decumbens (Ait.) Small. - ssp. decumbens (Ait.) Hult. (Hultén 1968) - var. decumbens Ait. ssp. groenlandicum (Oeder) Hult. Distribution: Alaska - Greenland

Synonyms: L. groenlandicum Oeder Rhododendron groenlandicum (Oeder) Kron et Judd

Ledum palustre in Hokkaido

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[1] along the seacoast of Hamatonbetsu, where Vaccinium vitis-idaea established, in Sarufutsu Village, northern Hokkaido, on August 27 2015. [2] in Shinsen Bog, central Hokkaido, on June 24 2007. [3/4] at the middle slope of Mount Tarumae on June 12 2008. [5] near the bothie (hut escaped from mountainous disasters) of Mount Tokachi, central Hokkaido, on June 27 2017. [6] at the middle slope of Mount Meakan on June 25 2013. [7/8] in a peatland mined in 1972, Sarobetsu mire, northern Hokkaido, on June 12 2019. [9] in Shibetsu wetland, eastern Hokkaido, on Augsut 28 2020. [10] on the southwestern slope of Mount Koma (flora) on July 10 2017.