This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Trillium undulatum.
Lily Family. May - June.
Found in rich woods. Quebec and Ontario to Georgia, west to Wisconsin and Missouri.
Solitary, 3 wavy-edged, white divisions marked with a crimson V at base.
Broad, in a whorl of 3 at the summit of stem, 8 - 15 inches high.

Painted Trillium.
Nodding Wake-Robin.
T. cernuum.
White, flower stem recurved so that the blossom hangs beneath the leaves.
Large-flowered Wake-Robin or White Wood-Lily.
T. grandiflorum. Found in same habitat, Western Vermont and Quebec to North Carolina, west to Minnesota and Missouri.
White, turning pink with age, divisions often 2 inches long.
 
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