I have a plant growing in my back back yard (I have two acres this part of which is relatively wild) that I am trying to identify. I think it is water hemlock except for a couple of things. First the leaf veins go out to the points of the leaf, which I gather water hemlock leaf veins do not. Second, it seems to have a bark which I gather water hemlock does not. It is about seven to nine feet tall and a fast grower. The are where in gets plenty of water, but I would not call it marshy. I am posting seven images which I think cover everything. Here is a picture of the leaf veins.