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.
The Hostapedia by Mark Zilis (2009), "...can also be listed as 'Koiwa'. The white-backed form
is called 'Urajiro Ko
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.