An article by
W.
George Schmid in
The
Hosta Journal (1996 Vol. 27 No. 2) states that this
is an "old" incorrect name for Hosta
longissima 'Nikazaki
Mizu'.

Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term mizu as water or 'Mizu Gibōshi' which is the Japanese name for the species
H. longissima. |