But it is 42% of the number of your native species. Or to put it another way, exotics make up 30% of your flora, the same percentage as stated by @marianwhit .
And I just had to follow the reply thread back to remember what this has to do with the topic of discussion: whether or not “out of range” is a valid reason to disagree with an ID. The gist of it seems to be that almost any species can show up anywhere, whether or not it succeeds in becoming established.
Question to ponder: you’re in a location where your only native crow is the American Crow. A vagrant or escaped New Caledonian Crow joins up with an existing crow flock. Can you identify it?