Trillium underwoodii, the longbract wakerobin, is a plant species found only in the southeastern United States (Alabama, Georgia, and northern Florida).

Trillium underwoodii is a perennial herb up to 20 cm tall, spreading by means of underground rhizomes. Leaves are multi-toned, with light, medium and dark splotches. Flowers are foul-smelling, usually deep maroon or purplish red but occasionally yellow.

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