White Spirea (Spiraea betulifolia Pall.)

POWO uses the Spiraea betulifolia Pall. to refer to a taxon strictly limited to East Asia and not found in North America. We suspect that this reflects a split in which the population USDA and BONAP refer to by this name is now considered by some other name(s); unfortunately POWO does not provide any tools to clarify this change so it may be some time before we sort this out.