Crataegus rivularis explained

Crataegus rivularis is a species of hawthorn known by the common name river hawthorn. It is native to the intermontane region of the northwestern United States, situated between the coastal ranges and the Rocky Mountains.^[1]

C. rivularis is one of the black-fruited hawthorn species. It is closely related to C. erythropoda, and less closely related to C. saligna.^{[1] [2]}

See also

• List of hawthorn species with black fruit

Notes and References

1. Book: Phipps, J.B. . O’Kennon . R.J. . Lance . R.W. . 2003 . Hawthorns and medlars . Royal Horticultural Society . Cambridge, U.K. . 0881925918 . registration .
2. Phipps . J.B. . 1999 . The relationships of the American black-fruited hawthorns Crataegus erythropoda, C. rivularis, C. saligna and C. brachyacantha to C. ser. Douglasianae (Rosaceae) . SIDA, Contributions to Botany . 18 . 3 . 647–660 . 41968885.