This non-registered form of the species H. longipes is from Japan and introduced by Takashima of Japan. It has dark green foliage with a wide, white marginal variegation.

A cultivar by this name was listed on the Hosta Library.

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.