This non-registered form of  the species, H. rupifraga comes from its native Japan. It is a small to medium size plant that grows to about 14 inches in height and a width of 47 inches. The leaves are ovate, wavy with smooth texture and thick substance. It has petioles with purple dots. The medium to dark purple flowers are borne in September.

According to The Hostapedia by Mark Zilis (2009), "This may be the same as Schmid's 'Urajiro Hachijo'. My only reservation is that the origins of the two seem to differ. This Japanese plant comes out of the commonly grown form of Hosta rupifraga, though that species has often been confused with H. longipes var latifolia."

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term urajiro as white-backed or white underside.

An article by Kevin Walek in The Hosta Journal (2008 Vol. 39 No. 2) states that, "H. 'Candy Dish' and its pod parent, 'Urajiro Hachijo', probably a form of H. longipes, both show potential for breeding outstanding piecrusted cultivars...Think about how many people coveted 'Donahue Piecrust' for its wavy edge and coloration. Now think about the same look on a much smaller leaf, with a much smaller and tighter clump. You can imagine the possibilities."

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."

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.

A second article by Warren I. Pollock in The Hosta Journal (2014 Vol. 45 No. 2) states that, "H. 'Liberty Bell' crossed with ('Urajiro Hachijo' × H. pycnophylla) is a favorite pod parent of Don's (Don Dean). He used it to produce H. 'Celtic Bouquet' and H. 'Peek-a-boo Purple', both registered in 2011, and H. 'Ebony Towers' and H. 'Garnet Spires', in 2005. (Special Note: Parentages of 'Garnet Spires' and 'Peek-a-boo Purple' were corrected in the 2013 Registrations issue)..."