Will the real Black Eyed Susan now please stand up...
Its not unusual for plants in different Genera to have the same common name.
All the more reason for using Botanical names.
In addition to your question
Any more Black Eyed Susans out there?
how about we list a few other ambiguous common names here?
Quite useful to me for the Master Database! I enter common names (in addition to Botanical names) when known.