I have three plants that emerged in my yard which borders a stream. The leaves have five leaflets on one of the plants, which is about 18" tall at present! This seems unusual - is this a rare phenom in this plant or common?
It would be unusual to have 5 leaflets. There are some other species that would have 5 leaflets though like A. quinatum and A. draconitum. You might look at those online and see if it matches yours.
