As my wife and I were returning from North Carolina on Monday, we passed a huge display of Trillium grandiflorum along the roadway.  (Several Trillium simile also included – we’ll see those later.)  Amongst the display I found this double form of the plant.  I don’t recall seeing one before.  6 petals, 6 leaves (bracts), 6 sepals (presumably, I see 5 in the photo, but didn’t count because I was precariously positioned on the roadbank taking the photo.)

Double Trillium grandiflorum