Originated by Katsuyoshi Tanaka of Japan, this non-registered, small to medium size cultivar is a sport of H. longipes. Its foliage is green with large "sectors" of golden-yellow on the leaf blade. The foliage is smooth textured and has thick substance. Leaves are very shiny underneath, slightly wavy and have heart shaped bases. It has dense clusters of pale purple flowers with purple anthers borne on 20 to 30 inch scapes in August into September.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term iwa as rock, Iwa Gibōshi or H. longipes.