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Hidakasanmyaku Erimo Tokachi NP, Hokkaido
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At Mt. Apoi, only 810 m tall, about 80 alpine-plant taxa grow, nearly 20 endemic. Summer sea fog cools the slopes, while thin, nickel-rich peridotite soil discourages forests from taking over.
A pale-lilac milkvetch was found in the Hidaka Mountains in 2024 and formally described in 2026. It is known from one limestone site; its authors recommend Critically Endangered status.
A Hidaka ridge, avalanche slope and lingering snowbed are different botanical neighborhoods: Hidaka-genge and yukiba-higotai favor wind-scoured ground, Hidaka-kinbai-sō avalanche slopes, and takane-kurosuge snowbeds.
At Mt. Apoi, Hidaka-sō reverses the usual leafy-first look: its white flowers appear from late April to early June, and the plant unfolds its basal leaves only after flowering.
The alpine-plant community at Mt. Apoi is a Special Natural Monument—and the only Japanese home of Himechamadaraseseri, a small skipper butterfly that is itself designated a national Natural Monument.
Yukiba-higotai’s woolly hairs help shield it from frost and ultraviolet radiation. This purple-flowered plant grows in Hidaka’s nickel-rich, nutrient-poor ultrabasic soils that challenge most plants.
Large-scale plant theft at Apoi in the late 1990s prompted local protection groups to form. Residents and partner agencies still patrol against poaching and work to restore the alpine plant community.
Hidaka’s alpine flower patches are not a continuous blanket: they occur mainly on ridges, summits and around cirques, scattered among dwarf pines and shrubs. Records list 9 endemic species and 7 endemic subspecies.
A temperature-based study estimated that Hidaka-sō began flowering about 7 days earlier in 2008 than in 1927. That change was modeled from ground temperatures, not measured by a century of flower counts.
