Assertion: douglas hawthorn | /r/HasProperty | crataegus douglasii
Facets:
Source sentences:
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.