I feel sorry for God. It can't be easy creating and sustaining the universe. What happened here, I think, is that He thought, "Well, it's time to make a new plant. I sure do like orangutans."
P.S. I don't really think God ever gets confused. The fact is that, like anyone---or at least anyone who believes in God---I am constantly marveling at the wondrous, infinite variety of life forms with which He expresses himself.