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(First upload on September 10 2013. Last on October 20 2023) [ 日本語 | English ]

Rhododendron L. (ツツジ) in Japan R. kaempferi Planch. Yamatsutsuji (ヤマツツジ, 山躑躅), mountain azalea Lifeform: semi-deciduous shrub < 5 m in height Distribution: endemic to Japan (south to southern Hokkaido) Habitat: sunny sites, such as forest gaps, forest edges, ridges, and grasslands Leaf: producing spring and summer leaves (a few summer leaves overwinter) Synonyms (confusing) Rhododendron scabrum G. Don var. kaempferi (Planch.) Nakai Rhododendron kaempferi Planch. var. lucidusculum (Nakai) Sugim. Rhododendron obtusum (Lindl.) Planch. var. kaempferi (Planch.) E. H. Wilson Rhododendron obtusum (Lindl.) Planch. var. kaempferi (Planch.) E. H. Wilson f. purpuriflorum T. Yamaz., nom.nud.

var. kaempferi (ヤマツツジ) f. album Nakai (シロヤマツツジ) var. macrogemma Nakai (オオシマツツジ) spring leaf = large and thick. summer leaf = slightly hard. flower = slightly fleshy and generally red-purple Izu Island Chain and southern Izu Peninsula var. mikawanum (Makino) Makino (ミカワツツジ) red-purple flowers and leaveds are smaller than var. obtusum eastern part of Aichi Prefecture (formely called Mikawa) var. saikaiense (T. Yamaz.) T. Yamaz. (サイカイツツジ) flowers and spring leaves are slightly larger than var. obtusum Goto Archipelago (Nagasaki Pref.), and Koshiki Archipelago (Kagoshima Pref.) var. tubiflorum Komatsu (ヒメヤマツツジ) summer leaf = slim. flower = red-purple. spring leaf = no elongation during flowering period Chugoku District along Seto Inland Sea

f. komatsui (Nakai) H. Hara (ヤエザキヤマツツジ) f. semperflorens H. Hara (シキザキヤマツツジ) f. latisepalum (Nakai) H. Hara (エゾヤマツツジ), when established: large sepal Hybrids: Rhododendron kaempferi Planch. × R. scabrum G. Don (ケラマヤマツツジ)

Rhododendron kaempferi in Hokkaidoo

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var. kaempferi (ヤマツツジ)

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[1] on the southeastern slope of Mount Koma (駒ヶ岳, flora), southern Hokkaido, on June 11 2013. [2/3] in Abira wetland, central Hokkaido, on June 16 2020. [4/5] along a tiny trail for looking around small islands in O-numa Park, southern Hokkaido, on July 7 2013. ⇒ flora on Mount Koma. [6/7] in Takoppe Wetland (Hangandate, 判官館), Niikappu Town, south-central Hokkaido, on June 13 2016. [8/9] at the fifth station on Mount Apoi (アポイ岳), south-central Hokkaido, on June 15 2016.

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var. macrogemma Nakai (オオシマツツジ)

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[1-3] at the middle of Mount Mihara, Izu-Oshima Island (伊豆大島), on June 7 2023.