The term 'Poison Ivy Cousin' refers to the plant species Rhus, commonly known as SUMAC (5 letters). SUMAC is a genus of flowering plants in the family Anacardiaceae, which also includes Poison Ivy and Cashew. SUMAC is native to many parts of the world, including North America, Africa, and Asia. It is a shrub or small tree that can grow up to 20 feet tall and produces clusters of red or yellow flowers. The leaves are usually compound and have a distinctive serrated edge. The fruit of the SUMAC plant is a drupe, which is a fleshy fruit with a single seed inside. SUMAC is often used as a spice in Middle Eastern cuisine and has a sour, lemony flavor.