Crataegus oxyacantha

The name Crataegus oxyacantha L. has been rejected as being of uncertain application, but is sometimes still used.

## Taxonomy[edit]

Linnaeus introduced the name Crataegus oxyacantha for a species of Northern European hawthorn[1] and the name gradually became used for several similar species, which were assumed to be the same, particularly the Midland hawthorn C. laevigata and the common hawthorn C. monogyna. In 1946, Dandy showed that Linnaeus had actually observed and described a single-styled species similar to the common hawthorn,[2] and the Midland hawthorn was effectively a later discovery. However, Byatt showed that confusion over the true identity of C. oxyacantha remained,[3] and the name was formally rejected as ambiguous by the International Botanical Congress.[2][4]: Appendix V, Nomina utique rejicienda More recently, Christensen concluded[5] that the species studied by Linnaeus matches C. rhipidophylla Gand., a relatively rare species.

## References[edit]

1. ^ Linnaeus, Carl (1753). Species Plantarum (in Latin) (1st ed.). Laurentius Salvius.
2. ^ a b Brummitt, Richard Kenneth (August 1986). "Report of the Committee for Spermatophyta: 30". Taxon. 35 (3): 556–563. doi:10.2307/1221918. ISSN 0040-0262. JSTOR 1221918.
3. ^ Byatt, Jean Irene (July 1974). "Application of the names Crataegus calycina Peterm. and C. oxyacantha L". Botanical Journal of the Linnean Society. 69 (1): 15–21. doi:10.1111/j.1095-8339.1974.tb01610.x. ISSN 0024-4074.
4. ^ Turland, N.J.; et al., eds. (2018). International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017 (electronic ed.). Glashütten: International Association for Plant Taxonomy. Retrieved 2018-06-27..
5. ^ Christensen, Knud Ib (1992). Revision of Crataegus section Crataegus and nothosection Crataeguineae (Rosaceae-Maloideae) in the Old World. Systematic Botany Monographs. Vol. 35\. Ann Arbor, Michigan, U.S.A: American Society of Plant Taxonomists. pp. 1–199. ISBN 978-0-912861-35-7. OCLC 26173211.