Of unidentified origin in
Japan, this non-registered cultivar is of unidentified parentage. It is a blue-green hosta.
The Hostapedia by
Mark Zilis (2009), "...probably refers to 'Urajiro
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.