Crataegus ×nitida (Engelmann) Sargent. Phen: Apr; Oct-Nov. Hab: Alluvial forests. Dist: S. IL, e. MO, e. AR.
Origin/Endemic status: Endemic
Taxonomy Comments: Described in the early 1900's as common in the Mississippi River floodplains near St. Louis; few subsequent documentations are known from the assumed natural range. Morphology is similar to typical C. viridis L., differing primarily in larger fruit (often 10-12mm) and thicker, glossy leaves with larger serrations. This entity has been variously interpreted in the literature as a species, a variety and an interserial hybrid; living cultivated specimens suggest a hybrid origin between C. viridis L. and C. crus-galli L.
Synonymy: = Crataegus nitida – F, FNA9, Il