Trillium recurvatum. I ordered these as T. erectum but received T. recurvatum.
Prairie Trillium (Trillium Recurvatum)
Seed pod + seeds and elaiosome (8 Sep. 2007)
First it doesn't look T. recurvatum at all.
When ready to flower it's leaves have changed a lot.
Flower (close-up; petals didn't open more than this)
A good sized patch of Prairie Trillium - the smaller plants clustered around the bigger plant might had been from when I accidently damaged the rhizome when it comes up very late one year.
Different shots of the same patch
view inside the flower, in my garden, 13th May 2008, Gent, Belgium
Taken at Briarwood Nature Preserve in Saline,LA