Crataegus ellwangeriana
Encyclopedia
Crataegus ellwangeriana is a 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,...

 that is not yet well understood. It is sometimes considered to be a synonym of C. pedicellata, and therefore a synonym of C. coccinea
Crataegus coccinea
Crataegus coccinea is a species of Hawthorn around which there is considerable confusion because the name has been misapplied for a long time. It has been shown to be the same as C. pedicellata, and under the International Code of Botanical Nomenclature, that older name Crataegus coccinea (common...

, which would place it in series
Series (botany)
Series is a low-level taxonomic rank below that of section but above that of species.In botany, a series is a subdivision of a genus...

 Coccineae. A study concluded, however, that C. ellwangeriana should not be included in series Coccineae.
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