 Japanese walnut is distinguished from butternut by its larger leaves and round (not oval) nuts.Prospect Rock Permaculture in Vermont has been backcrossing buartnuts with native butternuts, resulting in 'butterbuarts', which will most likely bear greater resemblance to the butternut parentage, although may also be more susceptible to the canker.The wood is light and takes polish well, but is of much lower quality than Persian walnut wood.