Native to (or naturalized in) Oregon:
- Broadleaf deciduous tree, 50-65 ft (~15-20 m); bark smooth, gray-brown. The terminal bud is often aborted or lacking. Leaves opposite, simple, about 15 × 15 cm, base deeply cordate, 3 to 5-lobed, lobes shallow, oval and terminated in a short point, middle lobe largest, margin doubly serrate, upper surface with an embossed and uneven texture, light green, underside pubescent; turn golden yellow to brown in the fall; petiole, green, to 15 cm long. Flower clusters (racemes) large, dense, and erect, appearing with the leaves. Fruit wings 3 to 5 cm long, held at obtuse angles, nutlets globose (seeds often sterile).
- Light to deep shade.
- Hardy to USDA Zone (5?) 6 Native to mountainous forests of Japan, at altitudes of 900-1800 m (~2900-5900 ft); rare.
- Federal Way, Washington: Rhododendron Species Foundation & Botanical Garden