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Walnut family
Juglandaceae
クルミ科
A family of large deciduous trees including walnuts, hickories, and pecans. Key identifying features are pinnately compound leaves and drupes (nuts) containing large edible seeds. About 10 genera and 50 species are distributed in temperate to tropical regions of the Northern Hemisphere; Japanese walnut (Juglans mandshurica) is native to Japan.
Key Characteristics
- ●Mostly pinnately compound leaves, often aromatic
- ●Flowers are unisexual; male flowers form pendulous catkins
- ●Fruit is a drupe with fleshy or dry exocarp and a hard endocarp (shell)
- ●Mostly large deciduous trees
Morphological Traits
A family may include species with different trait values — multiple values indicate the range within the family.
Leaf arrangement
Alternate / Opposite
Leaf type
Compound
Venation
Pinnate
Leaf margin
Entire
Growth form
Shrub / Tree
Evergreen/Deciduous
Deciduous
Compound type
Ternate / Pinnate
Stipules
Absent
Aromatic
Aromatic
Petal count
3 petals
Ovary position
Inferior
Stamen count
1-2
Plant sex
Dioecious / Monoecious
Phylogenetic Position
Angiosperms > Eudicots > Core eudicots > Fagales > Juglandaceae
Divergence Era
Late Cretaceous to Paleogene (about 90–70 million years ago)
Representative Genera
Related Evolution Events
- ・Adaptive evolution toward mammal dispersal through large nuts
- ・Independent evolution of wind pollination within Fagales
Plants in Walnut family on this site
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