An article by W. George Schmid in The Hosta Journal  (1996 Vol. 27 No. 2) states that This is a duplicate, incorrect or outdated name for Hosta kiyosumiensis 'Shirobana Kiyosumi'.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term shirobana as white flower.