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The Japanese walnut in particular is known for its huge leaves, which have a tropical appearance.
Japanese Walnut is distinguished from Butternut by its larger leaves and round (not oval) nuts.
Butternuts can hybridize with other trees like the Japanese walnut, which was introduced to North America in the 1800s.
The only significant disease Japanese Walnuts are susceptible to is the Walnut Bunch Disease.
The Japanese walnut (J. ailantifolia) is similar to butternut, distinguished by the larger leaves up to 90 cm long, and round (not oval) nuts.
The hybrid between Butternut and the Japanese Walnut is commonly known as the 'Buartnut' and shows resistance to the Butternut Canker.
Unlike the closely related and very similar North American Butternut, Japanese Walnut is resistant to the canker disease caused by the fungus Sirococcus clavigignenti-juglandacearum.
Also along the way, native stones carved into irregularly-shaped basins are noted and crushed stone paths traverse beneath a massive umbrella of a Champion Heartnut tree (a Japanese walnut).
The Heartnut is a cultivar of Japanese Walnut distinguished by its fruit, which is heart-shaped in cross section, easier to crack, and able to yield an unbroken nut meat when cracked.
Oikos also sells the following varieties of walnuts: Juglans cinerea, the butternut or white walnut; J. mycrocarpa, which is a smaller, 30-foot shrubby tree, and the buartnut, which is a cross between the butternut and the Japanese walnut or heartnut.
"Juglans ailantifolia")
Wörterbuch der Botanik