This non-registered cultivar is a seedling of H. longipes originated
by Kenji Watanabe of the Gotemba Nursery in Japan. It is a
miniature size plant with green foliage that has a
white, glaucous bottom.
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 and the term urajiro as white-backed or white underside.