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(First upload on May 29 2025. Last on July 12 2025) [ 日本語 | English ]

Rhododendron L. (ツツジ) in Japan Rhododendron japonoheptamerum Kitam. Lifeform: evergreen shrub, with 1-5 m in height Mycorrhiza: ericoid var. hondoense (Nakai) Kitam. Honshakunage (ホンシャクナゲ, 本石楠花), Japanese heath Distribution: endemic to Japan (south to Niigata in Honshu and Shikoku) Habitat: rocky cliffs and ridges on mountains Use: gardening Synonyms: Rhododendron metternichii Siebold et Zucc. var. hondoense Nakai. Rhododendron degronianum Carriére ssp. heptamerum (Maxim.) H. Hara var. hondoense (Nakai) H. Hara

f. leucanthum (Nakai) T. Yamaz. (シロバナホンシャクナゲ) var. japonoheptamerum Tsukushisyakunage (ツクシシャクナゲ, 筑紫石楠花) Distribution: endemic to Japan (Kii Peninsula, southern Shikoku and Kyushu) Synonyms: Rhododendron metternichii Siebold et Zucc. Rhododendron japonicum (Blume) C. K. Schneid. Rhododendron degronianum Carriére ssp. heptamerum (Maxim.) H. Hara f. albiflorum (Takeda) T.Yamaz. (シロバナツクシシャクナゲ)

var. kyomaruense (T. Yamaz.) Kitam. (キョウマルシャクナゲ) var. okiense T. Yamaz. (オキシャクナゲ)

Rhododendron japonoheptamerum in Japan

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var. hondoense (ホンシャクナゲ)

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[1-3] in the Wakayama Experimental Forest of Hokkaido University on June 26 2024.

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var. japonoheptamerum (ツクシシャクナゲ)

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[1-3] in a wildflower sanctuary managed by Minami-Aso Visitor Center, central Kyusyu, on December 17 2024.