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Crataegus collina : ウィキペディア英語版 | Crataegus collina
''Crataegus collina'' is a type of hawthorn that is closely related to ''C. punctata'', the dotted hawthorn,〔Phipps, J.B., O’Kennon, R.J., Lance, R.W. (2003). ''Hawthorns and medlars''. Royal Horticultural Society, Cambridge, U.K.〕 and sometimes considered to be the same species.〔Gleason, H.A,. Cronquist, A. (1963) Manual of vascular plants of Northeastern United States and adjacent Canada. W. Grant Press, Boston, Mass., U.S.A.〕 A sample of ''C. collina'' and ''C. punctata'' has suggested that ''C. collina'' is polyploid, and ''C. punctata'' is diploid, but a wider sample is needed to confirm that this is generally the case.〔Talent, N., Dickinson, T.A. (2005). Polyploidy in ''Crataegus'' and ''Mespilus'' (Rosaceae, Maloideae): evolutionary inferences from flow cytometry of nuclear DNA amounts. ''Canadian Journal of Botany'' 83: 1268–1304〕 ==References and external links==
* *(GRIN Species Profile )
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