I don't know what the correct name for this plant is, but we call it the Sausage Tree. We started with one small plant and now it has become a pest that seeds itself everywhere. Luckily the seedlings are large, easy to distinguish and easy to uproot. This is one that took root in the base of the garden wall. It has lumps knocked off it whenever I park the car in front of it, but it doesn't seem to care! Later in the year it will sprout bunches of leaves at the end of each sausage, followed by nondescript flowers that then produce large seed heads full of parachutes that carry the seeds far and wide.