Box Elders (Acer Negundo), also known as Ash-leaved maple looks just like Poison Ivy at first glance. The young box elder plant starts its growth with three leaves that upon first glance appears like Poison Ivy and as it grows and matures the stems and leaves change and is not as confusing.
How to tell it’s a box elder: Note the arrangement of leaves; they typically are opposite in Box Elders or side by side along the stem.