This is a non-registered seedling of
Japan. It is a small size hosta with green foliage
that bears white flowers in September. It is sometimes
incorrectly listed as H. gracillima alba.
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term hime as small, mini, dwarf or princess, the term iwa as rock, Iwa Gibōshi or
H. longipes and the term shirobana as white flower.