Which are the most frequent misidentification in vascular plants?
To be clearer, as an example, here in Italy in many cases people think that:
almost every wild rose is Rosa canina (actually the true Rosa canina sensu stricta is not always the most common taxon while other taxa belonging to section Caninae are commonly found)
almost every caper is Capparis spinosa (actually Capparis spinosa is absent in many regions while the most common caper found growing on walls is C. orientalis)
many broomrapes are identified as Orobanche minor (among broomrapes it is one of the most frequent but it can be locally absent and replaced by other Orobancheae)
dandelions are almost always identified as Taraxacum officinale (a name that should even be used)
and so on…
In my opinoin, it is an phenomenon that is linked to commonplaces that are widespread when dealing with natural sciences and spread by unexperienced people.
Are there similar cases in other countries?