broadleaf enchanter's nightshade, more...
[Circaea canadensis subsp. canadensis (L.) Hill, more]
From Flora of Indiana (1940) by Charles C. Deam
In woodland of almost all kinds, preferring wooded ravines and beech and sugar maple woods. Infrequent to frequent throughout the state except on the crests of black oak and chestnut oak ridges, on the dunes, and in prairies. The sepals of this plant are usually green, but sometimes are rose purple.