This is a small size sport of the
species H.
longissima found in the Nukata district of
Japan. It has joined flower lobes and some of the
stamens are petaloid i.e. have tissue on them that
resembles a petal. Flowers are medium purple in color
with purple anthers and are borne from mid-September to
October followed by viable seeds.
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term mizu as water, 'Mizu Gibōshi' or
H. longissima.
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