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(First upload on May 28 2011. Last on July 19 2024) [ 日本語 | English ]

Rhododendron L. Iツツジ) Used for gardening R. erubescens Hutch. (ベニオトメシャクナゲ*) R. indicum (L.) Sweet (サツキ) cv. hakatajiro (ハカタジロ) R. molle (Blume) G. Don (トウレンゲツツジ) f. flavum (Miyoshi) Yonek. (キレンゲツツジ) R. schlippenbachii Maxim. (クロフネツツジ)

R. × hybridum Ker Gawl. (セイヨウシャクナゲ) R. × mucronatum (Blume) G. Don (リュウキュウツツジ) cv. kanoko (カノコ) cv. narcissiflorum (シロマンヨウ) cv. plenum (フジマンヨウ) R. × obtusum (Lindl.) Planch. (キリシマツツジ) cv. sakamotoi (クルメツツジ) R. × pulchrum Sweet (ヒラドツツジ) cv oomurasaki (オオムラサキツツジ)

Rhododendron erubescens transplanted at SEATAC Airport

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Etymology of species epithet: Pere Farges rhododendron

Lifeform: evergreen shrub < 3 m high Origin: Sichuan, Gansu, and Hubei in China (unpopular gardening tree in Japan) Habitat: acid soil

Synonyms: Rhododendron oreodoxa var. Franch. var. fargesii (Franch.) D. F. Chamb. Rhododendron fargesii Franch.

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[1-3] at SEATAC International Airport, WA, on March 23 2013.

Rhododendron indicum in Japan

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Satsuki (サツキ, 皐月), satsuki azalea Life form: (semi-)evergreen shrub Distribution: south to Kanto District, Japan (endemic) Habitat: moistened, acidic soils and rocks in valleys

Shoot: dense hair when young Leaf: producing spring and summer leaves, sharp top Stamen: five

Use: gardening (≈ 2,000 cultivars), hedge, bonsai, etc. (transplanted in Hokkaido) Chromosome number: 2n = 26 f. otakumi T. Yamaz. (オタクミツツジ) Cultivars (probably more than 1,000): Hakatajiro (ハカタジロ, dwarf stem and white flower), etc.

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[1-3] at Kanda, Tokyo, on May 11 2013. At that day, it was a festival. (平成二十五年 五月十二日(日曜) 神田明神氏子神輿入り)
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[4-6] on the southwestern slope of Mount Koma (flora), southern Hokkaido, on July 10 2017. This species is not naturally distributed in Hokkaido. Probably immigrated by wind from the bottom of the mountain.

cv. Hakatajiro (博多白)

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[1] at a hedge in front of an apartment in N17/W4, North Ward, Sapporo, on June 17 2023. [2] beside Patagonia, N13/W4, North Ward, Sapporo, on June 20 2018. [3] at a house garden in N27/E2, East Ward, Sapporo, on June.

Rhododendron schlippenbachii Maxim. transplanted in Sapporo

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Kurofunetsutsuji (クロフネツツジ, 黒船躑躅), royal azalea Life form: deciduous shrub < 5 m tall

Distribution: Manchuria - Far East - Korea (introduced to Japan in 1668)

Habitat: mountainous forests Flower: red-brown spots on three upper petals

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[1-3] this shrub was transplanted on September 26 1980 for the golden anniversary of Faculty of Science, Hokkaido University. In front of the Hokkaido University Museum on May 20 2011. This year I entered the university. [4-6] at a house garden, N20/W4, North Ward, Sapporo, on May 17 2017.

Rhododendron × hybridum Ker Gawl. in Hokkaido

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Formula hybridae: R. maximum L. × R. viscosum (L.) Torr.

Seiyoushakunage (セイヨウシャクナゲ, 西洋石楠花)

Distribution: not naturally distributed, because of cultivar made mostly in Europe and USA

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[1] cv. President Roosevelt in Tomakomai Sun Garden glasshouse on January 10 2022. [2/3] in front of the Faculty of Engineer, Hokkaido University, on May 11 2019. Also taken on May 3 2019. [4-6] in a house garden, West Ward, Sapporo, on May 5 2020.

Rhododendron × mucronatum (Blume) G. Don in Hokkaido

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Ryukyutsutsuji (リュウキュウツツジ, 琉球躑躅) Lifie form: semi-evergreen shrub

Distribution: cultivated after Edo Era

Leaf: hairy, producint spring and summer leaves Flower: large, white

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[1-3] in front of a building, N15/E1, East Ward, Sapporo, on June 1 2018.

Rhododendron × obtusum (Lindl.) Planch in Hokkaido

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Kirishimatsutsuji (キリシマツツジ, 霧島躑躅) Satatsutsuji (サタツツジ) Lifeform: semi-evergreen shrbu, with 1-3 m in height

Origin: R. kaempferi Planch. × R. kiusianum Makino Flower: 2-4 cm in diameter

cv. sakamotoi: Kurumetsutsuji (クルメツツジ, 久留米躑躅)

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[1-3] on a house garden in N20/W4, North Ward, Sapporo, on May 17 2024.

Rhododendron × pulchrum Sweet in Japan

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Hiradotsutsuji (ヒラドツツジ, 平戸躑躅), snow azalea or Hirado azalea Life form: evergreen shrub < 3 m high Distribution: transplanted (in various regions of Japan), recorded in "Wakansansaizue (和漢三才図会 1712) Habitat: partial sun to partial shade on well-drained, acidic or neutral soil Tolerant to air pollution - street tree

Cultivars: > 300 spp. cv oomurasaki Oomurasakitsutsuji (オオムラサキツツジ, 大紫躑躅), pretty azalea, pretty rhododendron, purple Aaalea, etc. Synonyms: Rhododendron oomurasaki Makino Rhododendron × pulchrum Sweet var. speciosum (Makino) H. Hara

Hybrid: R. indicum (L.) Sweet (サツキ) × R. mucronatum G. Don (キシツツジ), cultived after the Edo Era cv shounoshin (ショウノシン, 正之進). pink flower → pale pink cv shirotae (シロタエ, 白妙). white flower cv akebono (アケボノ, 曙), pink flower

cv oomurasaki

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[1-3] at Kansai International Airport on March 27 2013. [4] in the a historical place of Kitano purification plant, Kobe, western Japan, on March 16 2019.

cv shirotae

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[1-3] in a small garden near N17/E1, East Ward, Sapporo, on June 1 2018.