These are some photos I took at Spencer Gorge Conservation Area in Hamilton ON, 12 March 2013.
White baneberry (Actaea pachypoda, Ranunculaceae). This plant gets crazy white fruits on red stalks that are poisonous. In the plant world “bane” means poisonous. Check out more pics here.
Jack-in-the-pulpit (Arisaema triphyllum, Araceae). These flowers are typically either male or female, the larger plants normally being female. Insects are attracted into the cozy nook at the bottom of the flower. Male flowers have a little hole that allows the insect to escape, covered in pollen of course. There is no hole in female flowers and the insects are typically trapped. Perhaps a trapped insect is more likely to fertilize the flower? Some more info here.
UPDATE: In the comments a friend suggested this is Anemone quinquefolia (Ranunculaceae), and I think she is right. Dickinson et al say: “The buttercups [Ranunculaceae] can be mistaken for members of the rose family [Rosaceae] but they lack the stipules and [flat cup-shaped] hypanthium (floral tube) that are often conspicuous in that family.” So it is understandable that I could think this was in the Rosaceae, but I will know better next time :)
Hairy solomon’s-seal (Polygonatum pubescens, Asparagaceae). The genus name comes from the Greek word poly, meaning “many”, and gony, meaning “knee” which is reference to the jointed stem seen in the first photo; pubescens means hairy (this info from the ROM Field Guide to Wildflowers of Ontario). The second photo shows the flower buds hanging down from the stem.