Any of about 25 species of spring-flowering perennial herbaceous plants that make up the genus Trillium in the lily family , native to North America and Asia.
Whorls of oval leaves, flower parts, and fruits are arranged in groups of three. Each solitary white, greenish-white, yellow, pink, or purple flower is borne on a short stalk that arises from the whorl of leaves. Many species are cultivated in wildflower gardens. Wild trillium (also called wake-robin or birthroot) is a protected species.