Here is a rhododendron that is probably lost to the trade, but I was able to get one plant years ago from the Meerkirk Garden on Whidbey Island, Washington State. The flowers are quite large with a flared corola, pink with a yellow throat. The flowers are held in full trusses of 6-7 florets, and have a 'glow' due to the yellow. The plant has attractive foliage and will grow to 5 ft tall x 6 ft wide in 10 years. Hardy to zone 7.