Crataegus coccinea
Encyclopedia
Crataegus coccinea is a species of 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,...

 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
Crataegus pedicellata
Crataegus pedicellata is a name for a species of Hawthorn that has been shown to be the same as C. coccinea L., common name "Scarlet Hawthorn". Under the International Code of Botanical Nomenclature, the older name should be used. Considerable confusion persists, however, because the name C...

, and under the International Code of Botanical Nomenclature, that older name (C. coccinea) should be used.
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