This white-backed form of H. 'Amagi Iwa' (aka H. longipes latifolia) is from an unidentified originator in Japan and was registered by Kevin Walek (Hosta Registrar) in 2009 and re-registered with new data in 2018.

It is a medium size hosta about 15 inches high by 32 inches wide with dark green foliage. The leaves are broadly ovate, smooth, moderately rippled and shiny on top with pruple-red dotted petioles. Purple, tubular flowers bloom in September but the seed set was unknown at the time of registration.

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.

An article by Warren I. Pollock in The Hosta Journal (2014 Vol. 45 No. 2) states that, "Correctly, 'Urajiro Hachijo' should be 'Urajiro Amagi Iwa', registered in 2009. It is the white-backed (urajiro) form of H. longipes var. latifolia having glossy, broad rippled-edged leaves."