Assertion: hawthorn's thorn | /r/CapableOf | grow up to 1 1/2 inches
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text: The black hawthorn, also called the Douglas hawthorn (Crataegus douglasii) has straight to slightly curved 1-inch thorns, while the river hawthorn (Crataegus rivularis) has thorns that grow up to 1 1/2 inches.