It does not have a trunk that can be seen. And it is huge, all the leave stalks seem to be growing out of the ground
Here is one growing in the water, not a great picture but hope it will help
I am not either what is odd is the one growing on the fountain in the middle of the stream, it has been there many years with out getting much bigger.
have a call in to the park hoping they can tell me what that is and the name of the snake I took a picture of