I use the flowerchecker app http://www.flowerchecker.com/ where you have to pay a small fee per plant identification. It actually uses real human biologists to identify the plant.
"An expert in or student of the branch of science concerning living organisms."
That is mostly true. The existence of animals with diplomas[1] is the exception to the rule.
1. https://en.wikipedia.org/wiki/List_of_animals_with_fraudulen...