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is a species of hawthorn
Crataegus , commonly called hawthorn or thornapple, is a large genus of shrubs and trees in the rose family, Rosaceae, native to temperate regions of the Northern Hemisphere in Europe, Asia and North America. The name hawthorn was originally applied to the species native to northern Europe,...
known by the common name river hawthorn
. It is native to the intermontane
Intermontane is a physiographic adjective formed from the prefix "inter-" and the adjective "montane" Usage includes intermontane basin such as New Zealand's Mackenzie Basin and intermontane...
region of the northwestern U.S., situated between the coastal ranges and the Rocky Mountains
The Rocky Mountains are a major mountain range in western North America. The Rocky Mountains stretch more than from the northernmost part of British Columbia, in western Canada, to New Mexico, in the southwestern United States...
is one of the black-fruited hawthorn species. It is closely related to C. erythropoda
Crataegus erythropoda is a hawthorn native to the southern Rocky Mountains in the U.S. The leaves are conspicuously shiny above and fruit are dark purplish red. It is seldom cultivated, but at one time was listed in the nursery trade under the common name "Chocolate Haw". It is closely related to C...
, and less closely related to C. saligna
Crataegus saligna is a species of hawthorn known by the common name willow hawthorn that is seldom cultivated and rather rare in the wild. Its native range is wet areas of western Colorado and northeastern Utah. It is a handsome shrub or small tree with delicate-looking leaves, small flowers, small...