Rhododendron serpyllifolium is a rhododendron species native to Honshu, Kyushu, and Shikoku, Japan. It is placed in section Tsutsusi. It is a shrub that grows to in height. Its flowers are white to pink.

References

Ann. Mus. Bot. Lugduno-Batavi 2:165. 1866 JSTOR, A.Gray specimen