This map is tentative at best. There has been difficulty regarding the correct identification between Lonicera morrowii and Lonicera x bella. Distinguishing between L. morrowii and L. x bella is particularly difficult, even in flower, and impossible in fruit or when encountered in a sterile condition. Therefore proper field assessment and collection is only productive during the flowering window. Subsequently, reports of L. x bella might be mis-identifications of L. morrowii; and conversely, L. x bella may easily be overlooked in areas saturated with L. morrowii. Molecular-based research may be needed to yield clearer resolution between these two taxa and might demonstrate that L. x bella is in fact more common.
