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

      
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

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