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

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