White Wake Robin (White Trillium)
The large size and nodding or horizontally spreading flowers help to identify this trillium. Flowers large, triangular, with white petals; sepals 3, narrow, green. Flower to 2½ inches across on a stem, either horizontal or drooping when in bloom. Blooms April-May. Leaves 3, heart-shaped, pointed, large, in a whorl, usually as broad as long, to 9 inches long, green but not mottled.
There are 7 species of Trillium in Missouri. Snow or dwarf white trillium (T. nivale) is uncommon, mostly in northeast Missouri. It's the smallest and earliest-blooming trillium in our state and often forms colonies. Green trillium (T. viridescens) lives mostly in the southwestern Ozarks and has green or yellowish-green petals, sometimes with a purplish tinge.