cow parsley is not as precise as you might think, either. Text books will tell you it's anthriscus sylvestris, but lots of people will point to a clump of daucus corota and call it cow parsley (and both get called Queen Anne's lace). And then there's cow parsnip - Heracleum sphodylium - or hogweed. As opposed to giant hogweed. And they all look quite like hemlock if you aren't looking too botanically.
The thing with wild umbellifers is it's REALLY important to know which one it is, because they range from mildly toxic to deadly poisonous with hardly any difference to look at and very similar - or interchangeable - common names. So this is one class where you need to use the proper names