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(First upload on September 10 2013. Last on September 13 2016) [ 日本語 | English ]

Rhododendron kaempferi Planch.






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

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)
索引

Rhododendron kaempferi in Hokkaidoo


var. kaempferi

ST1 ST2 ST3
ST4 ST5 ST6
ST7 ST8 ST9
[1-3] on the southeastern slope of Mount Koma, southern Hokkaido, on June 11 2013. [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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