Juglans mandshurica other popular "Juglans" species and usually causes few significant allelopathic effects in cultivation. "Juglans cathayensis", characterized by tomentose leaflets, producing more flowers per spike and growing south of the Yellow River, was sometimes recognized as a species separate from "J. mandshurica". The Japanese walnut ("oni-gurumi") is listed by some authorities as "Juglans mandshurica" var. "sachalinensis" (syn. "Juglans ailantifolia") Juglans mandshurica Juglans mandshurica, the Manchurian walnut, is a deciduous tree of the genus "Juglans" (section "Cardiocaryon"), native to the Eastern Asiatic Region (China, Russian Far East, North Korea and South Korea). It grows to about 25 m. The leaves are alternate,
Juglans olanchana Juglans olanchana Juglans olanchana is a semideciduous tree species in the Juglandaceae family. It can be found in Costa Rica, Guatemala, El Salvador, Honduras, Mexico and Nicaragua. It can grow up to 40 m in height and 1.5 m in diameter. The long branches bear twigs tipped with 40–50 cm long, glabrous, pinately compound leaves, darker on the top than on the bottom. The base of the trunk sometimes has buttresses. "Juglans olanchana" grows in wet and very wet tropical forests, most frequently on river banks, observed from 0–1400 m above sea level. Reports that it also grows in the