Crataegus × smithiana, or perhaps more correctly Crataegus 'smithiana', is a hybrid hawthorn

Crataegus

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,...

 commonly known as Red Mexican Hawthorn. The hybrid is said to have originated at the Yarralumla Nursery in Canberra, Australia. This handsome tree has been planted along several streets in Canberra.

Taxonomy

The Latin binomial that is sometimes used, Crataegus × smithiana or the equivalent C. smithiana, appears to have never been validly published under the rules of the International Code of Botanical Nomenclature.