American Bur --------European 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 European Chestnut Burs: A dense mass of long, stiff spines Spines are 2 to 3 cm long, 0.75 mm thick Up to 3 nuts per bur
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