This is a "series" of H. 'Tokudama' seedlings originated by Roland Tisch of Michigan and registered on his behalf by Peter Ruh of Ohio in 2002. It bears dense clusters of near-white flowers from late June into July.

This is a confusing situation since one name appears to represent several different H. 'Tokudama' seedlings that have somewhat varying descriptions. I have never seen this  type of name game before...and don't want to see another.