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Diapensia lapponica L.

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

Order Diapensiales (イワウメ)

Family Diapensiaceae Lindl. (イワウメ)
Engler's syllabus (エングラー体系)
5-7 genera (⇒ APG: Ericales)
Berneuxia Decne.
Diapensia L. (イワウメ)
Galax Sims
Pyxidanthera Michx.
Schizocodon Sieb. et Zucc. (イワカガミ), when separated from Shortia
Shortia Torr. et A. Gray (イワウチワ)

Diapensia lapponica L. in Hokkaido

One species distributed in Japan
Lifeform: evergreen shrub
ssp. lapponica (ホソバイワウメ)
ssp. obovata (F. Schmidt) Hultén
Iwaume (イワウメ, 岩梅), pincushion plant
Distribution: Siberia - Korea - Japan (north to central Honshu) - Sakhalain - Kamchatka
Habitat: spring ephemeral in the original sites, woods, thickets, hedgebanks and meadows, usually in hilly areas and in calcareous soils Synonyms:

Diapensia lapponica L. var. obovata F. Schmidt Diapensia obovata (F. Schmidt) Nakai
f. rosea Honda (ベニバナイワウメ)

Between Komakusa-daira Plain and Mount Akadake, central Hokkaido, on July 9 2014 (by Miyazaki N)