A tricillium is a type of flowering plant belonging to the genus Trillium, which is known for its characteristic three-petaled flowers and whorled leaves. These perennial plants are typically found in wooded areas of North America and parts of Asia. Tricilliums are important for their ecological role in providing habitat and food for various pollinators, and they are often appreciated for their ornamental value in gardens. They are also commonly referred to as "three-leaved nightshade."