The term CALLA is a genus of flowering plants in the family Araceae. It is commonly known as the Calla LILY, and is composed of four species of plants, including the ARUM (4 letters), AROIDS (6 letters), and AROID (5 letters). The most common species is the Calla LILY, which is also known as the ARUM (4 letters). This plant is native to wetland areas in Europe, Asia, and Africa, and is widely cultivated for its attractive white flowers.