Rhododendron stenopetalum is a rhododendron species native to southern Honshu and north-eastern Shikoku, Japan. It has been placed in subgenus Azaleastrum. It is a low shrub, with leaves that are 3–5 mm wide by 5 cm long. Its flowers are pink or lavender-pink.
References
Sources D.J. Mabberley, 1990 In: Feddes Repert., 101(5-6): 270 GBIF US Plant National Germplasm System Oregon State University American Rhododendron Society