This cultivar was listed on the MyHostas Database website. Originated by Monty and Julie Carlson of Minnesota, this non-registered cultivar is of unidentified parentage but has H. longipes var. latifolia 'Urajiro Hachijo' in its background.    

According to MyHostas Database, this cultivar and H. 'Lemon Smoothie' are called the "Smooth Sisters".

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.

The image shown above was labeled 'Berrie Smoothie' and we could find no information on such a hosta. We suspect that this might actually be a picture of this cultivar...but we don't know for certain.