No key was found for the requested taxon, but its parent (Trillium) is keyed as shown below.

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Key to Trilliaceae

Trilliaceae

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1 Flowers white with a triangular red blaze at the base of each petal; leaves petiolate, the petiole > 5 mm long; leaves acuminate
1 Flowers variously colored (including white), but never with a triangular red blaze; leaves sessile to short-petiolate (petiole < 3 mm long); leaves obtuse, acute, or slightly acuminate