This is a green hosta with white streaks in the foliage. It is a medium size sport of the species, Hosta kiyosumeinsis, from Japan. The foliage is slightly wavy and faintly corrugated. Pale lavender flowers bloom from mid-July into August.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term -gawa or -kawa as river.