Rhododendron indicum is an azalea Rhododendron species native to Japan (S & W Honshu, Shikoku, Kyushu, Yakushima).

[4] It is the type species for the Tsutsusi section and subsection, and was the original Tsutsusi described by Engelbert Kaempfer in Japan in 1712,[5] from the Japanese name Kirishima-tsutsuji.

There are many cultivars,[6] including the Satsuki azaleas.

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