Gibōshi, the "white-dappled hosta" is named buchi
meaning "with patches of a different color," but in a
wider sense simply "variegated." A cultivar that is
small, veins 3-4, with yellowish white margins." This is
listed as a mutation of
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term shirobuchi as white edge(d).