Found this among a large stand of rhododendron growing wild where a neighbor is buiding a new home. There are 900 kinds and I don't know which this is although it rather resembles minus or ambiguum as pictured on the excellent website of Dr. Karen A. Kron of Wake Forest, There are many stunning photos of rhododendrons and related plants at her site - http://www.wfu.edu/~kronka/kakbek/rhododendrons.html - take a look.