Trillium cuneatum - wood lily or sweet Betsy - native, will naturalize!
The largest and most vigorous of the sessile trilliums that are native to the eastern U. S.
The Trillium features three leaves in a terminal whorl subtending a solitary flower From an underground rhizome, a stout, unbranched, naked stem rises in spring to 12-18" tall topped by an apical whorl of three prominently-veined, ovate to egg-shaped leaves (typically to 3-7" long). Each leaf is green, mottled with irregular gray-green blotches. From the center of the leaf whorl emerges a single sessile three-petaled maroon flower during the period of late March-early May.