Trillium vaseyi

Trillium vaseyi, the sweet wakerobin or sweet beth, is a spring flowering perennial plant which is found only in the southeastern United States, primarily in the southern part of the Appalachian Mountains but with a few populations farther south.
Sweet wakerobin has among the largest flowers in the trillium family, with red petals up to 7 cm long. It grows in rich woods, sometimes on riverbanks but other times on steep slopes.