This is a non-registered seedling of
Kenji Watanabe in
Japan. It is a large size plant
with thick textured, green foliage. The flower scapes
The Hostapedia by Mark Zilis (2009), "This is probably similar to the flattened scapes that
'Oh My Heart' and others develop."
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term oba or ooba as large leaf, 'Oba Gibōshi' or