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The name Crataegus columbiana is a source of considerable confusion. The species named by Howell is now considered to be the same as ''C. douglasii'', named earlier, and the earlier name should be used instead.〔Phipps, J.B. (1995). The identity of ''Crataegus columbiana'' and its relationship to ''C. piperi'' (Rosaceae). ''Taxon''. 44(August): 405–408.〕 However, some varieties of ''C. columbiana'' have also been named that are not related to ''C. douglasii''. ''C. columbiana'' has been used by some authors for ''Crataegus piperi'' Britton, which is now known as ''C. chrysocarpa'' var. ''piperi''.〔Phipps, J.B. (1998). Introduction to the red-fruited hawthorns (''Crataegus'', Rosaceae) of western North America. ''Canadian Journal of Botany''. 76(11): 1863–1899.〕〔Phipps, J.B.; O’Kennon, R.J. (2004). A review of ''Crataegus'' series ''Rotundifoliae'' (Rosaceae) in western Canada. ''Sida Contributions to Botany''. 21(1): 65–77.〕 For ''C. columbiana'' var. ''chrysocarpa'' (Ashe) Dorn see ''C. chrysocarpa'' Ashe. For ''C. columbiana'' var. ''piperi'' (Britton) Eggl. see ''C. chrysocarpa'' var. ''piperi'' (Britton) Kruschke. For ''C. columbiana'' var. ''occidentalis'' (Britton) Dorn see ''C. succulenta'' Schrad. ex. Link (including ''C. macracantha'' var. ''occidentalis'' (Britton) Eggl.). ==References== 〔 *(USDA Plants Database ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Crataegus columbiana」の詳細全文を読む スポンサード リンク
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