How would I call this kind of map / decision tree, typically used by scouts, to identify different kinds of trees, plants, mushrooms, birds, butterflies, etc.?
On every node, there is a yes/no question, and depending on the answer you go to one of the children nodes. You repeat this until you are in a leaf node which gives you the name of the thing you are identifying.
I have tried searching for images with {mushroom, tree, bird} {classification, identification} {tree, map, [search] card} [scouts] but haven't been able to find anything in English, so I think there is some idiomatic expressing that I'm missing. The below image is in Dutch, found by the term "zoekkaart" (search card/map).
Example sentence: "Follow the directions on the X to {identify, classify} the observed item."