Japanese Chestnuts (Castanea crenata)

Leaves

Japanese Chestnut Leaf

Very small teeth on leaf edges
Leaf elongate, with almost parallel sides

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Burs

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American Bur ——–Japanese Bur

American Chestnut Burs:
A dense mass of long, slender spines
Spines are 2 to 3 cm long, 0.5 mm thick
Up to 3 nuts per bur

Japanese Chestnut Burs:
A mass of spines that interlock in a thatched pattern
Up to 3 nuts per bur

 

 

Nuts

4_species_nuts_top

American – Chinese – Japanese – European

American Chestnuts:
Nuts are relatively small, 1/2 to 1 inch in diameter
Tips of American chestnuts are pointed
Nuts are hairy over 1/3 to 2/3 of length from pointed end
Vascular bundles in a sunburst pattern on hilum end
2 to 3 nuts in each bur

 

4_species_nuts_side

American – Chinese – Japanese – European

Japanese Chestnuts:

Nuts are relatively large, 1 to 2 inches in diameter
Tips of Japanese chestnuts are pointed
Very little surface hair; only at tip
Vascular bundles in a diffuse pattern on hilum end
2 to 3 nuts in each bur