I would'n bet the farm on this one but it sure has the trappings of a late twenties Hudson/Essex. Note the suicide doors and the three rivit heads on the(A)piller. What I don't see is the cowl lites holes on the forward portion of the cowl next to where the hood matches up.Everything else says it's a Hudson or Essex.
It looks like a former flowerpot, according to the remaining tree trunk. It looks like it grew on the metal, so the only way to get it off without causing major damage to the car is to burn it off. Since the salvagable parts are all metal, there shouldn't be too much harm to the car.