trillium or wake-robin trĭl´ēəm [key], any plant of the large genus Trillium, attractive spring wildflowers of the family Liliaceae ( lily family), native to North America and E Asia. The leaves, petals, and sepals are characteristically in threes, and the single flower may be white, pink, dark red, yellow, or green. The plants have a perennial rootstock that in T. erectum (also called birthroot) was used medicinally by both Native Americans and early colonists. Trillium is classified in the division Magnoliophyta , class Liliopsida, order Liliales, family Liliaceae.

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