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Japanese Walnut
Juglans mandshurica var. sachalinensis
オニグルミ
A deciduous tall tree native to mountain valleys in Japan. The drupe has an extremely hard shell, and the kernel inside is edible. Leaves are large, odd-pinnately compound. It displays beautiful yellow autumn foliage and is the representative Juglans species of Japan.
Identification Points
- ✓Large odd-pinnately compound leaves (7–17 leaflets)
- ✓Fruits enclosed in a green husk; the inner drupe is extremely hard
- ✓Bark is grayish-brown with shallow longitudinal fissures
Habitat
Along mountain valleys and in moist forests
Season
April (flowers), September–October (fruits)
Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Alternate
Leaf type
Compound
Venation
Pinnate
Leaf margin
Serrate
Leaf shape
Ovate
Growth form
Tree
Evergreen/Deciduous
Deciduous
Petal fusion
No petals
Habitat
Mountain
Petal count
3 petals
Stipules
Absent
Ovary position
Inferior
Aromatic
Aromatic
Stamen count
1-2
Phylogenetic Positionクルミ科 →
Phylogenetic Position
Angiosperms > Eudicots > Core eudicots > Fagales > Juglandaceae
Divergence Era
Late Cretaceous to Paleogene (about 90–70 million years ago)
Evolution Notes
Juglandaceae secretes juglone, a chemical that exerts allelopathic effects on surrounding plants. The hard-shelled drupes are dispersed by squirrels and other rodents—an example of coevolutionary mutualism.
View on evolution timeline →Sources & References
AI-generated, needs verification