type plant is a non-registered hosta from Japan. It has
green foliage that has chartreuse colored streaked
The Hostapedia by Mark Zilis (2009), "The
Wade and Gatton plant has sported to all-green foliage. It
can also be found in a few collections in Japan."
A cultivar by this name
was listed on the
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term -gawa or -kawa as river.