This is a naturally
occurring variety of the species
from China which has been cultivated in
Japan for a long
time. It has narrower leaves than the species with wavy
foliage. The petals on the fragrant white flowers are
also narrower. It blooms from August into September.
In an article in
Hosta Journal (2016 Vol. 47 No 2), the author
described this plant's flowers as having a "Very Strong"
fragrance compared to other hostas.