Hosta montana Shunko Nishiki New Guinea Thad used this for many

Thad used this for many of his great hybrids that would follow

then you've missed one of the best blue-flowered members of the genus Baptisia

this may be the closest you'll ever get

spread the roots out horizontally and plant shallow

Though it might be worth mentioning that there are 70-some wild species and a few occur in wet sites

Hosta montana Shunko Nishiki New Guinea Thad used this for manyThis beautiful sport of the large growing Hosta montana was discovered by Japanese nurseryman Hiroyoshi Watanabe. It superficially resembles H. 'On Stage' (Choko Nishiki) with long, pointed leaves featuring a brilliant white center and contrasting medium green border. Each 3'+ clump (we don't know a mature size, since most Japanese grown plants are kept in tiny little pots) is topped with stalks of light lavender flowers on 48" scapes.