Rhododendron rex (大王杜鹃), the king rhododendron, is a tree species, usually 5–7 meters in height, in the family Ericaceae. It is found in China, India, and Myanmar, where it is threatened by habitat loss. Flowers are creamy-white, or pale yellow to pink, with a crimson basal blotch. Leaves are 17–27 cm in length and are covered on the underside with indumentum that ranges in colour from greyish to rusty brown.
The Royal Horticultural Society describes Rhododendron rex and its subspecies as very large ...