Publication: Sida 18(1): 170-178, f. 2, 3 [map], 4a-c,f.
selected vouchers: WTU
Notes: Recently described (Phipps & O'Kennon 1998) and found east of the Cascades. A segregate from C. douglasii, differing in its fruit shape, fruit waxiness, twig color, and larger flowers. It is often difficult to identify. A key to black-fruited taxa is provided in Phipps & O'Kennon (2002).
» Phipps, J. B. and R. J. O'Kennon. 1998. Three new species of Crataegus (Rosaceae) from western North America. C. okennonii, C. okanaganensis and C. phippsii. Sida 18: 169-191.
» Phipps, J. B. and R. J. O'Kennon. 2002. New taxa of Crataegus (Rosaceae) from the northern Okanagan-southwestern Shuswap diversity center. Sida 20: 115-144.
» Phipps, J. B., with R. J. O'Kennon and R. W. Lance. 2003. Hawthorns and Medlars. Timber Press, Portland.