just wound a way you can do this, found it while reading up on "Map UVs to a smooth model and transfer to the original", of all places...
Anyway, select the flower that has the correct UV map on it, then shift select the one you want to copy it to. Go to the Polgons menu and select Transfer, make sure you've got UV Sets selected and hit apply.
Theonly 'drawbacks' I can find is that you need to select two objects each time you apply the command, and that you can only transfr the UVs to one object at a time.
But hey, sure beats duplicating and translating the UV mapped flower all over again..