If you took Latin in high school, or you're a botanist, then you've probably already figured out what this is, but if you're are a regular person, then Dendrophilia might not be a word that's familiar to you, Dendrophilia is the condition of being sexually aroused by trees.
"Sexual fetishism" would generally be defined as a sexual arousal from a physical object or a specific situation. So in the case of Dendrophilia, could mean that just being in the presence of a bunch of trees makes you want to do it with somebody. It could also be the case that you want to pleasure yourself with/on/next to the tree.
Regardless of the eventual object of your desire, Dendrophilia means that desire is initiated by a tree. Some would say that's strange, but there is so many reasons to develop a fetish that one persons normal is another persons weird, so we just believe people should just get over any worries and not have negative opinions about others.
- main Fetishes page