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I included these as examples of confusing Trilliums. The above are all classed as Trillium erectum, which can be a highly variable species. I used a special Trillium key that was prepared by Mr. Tom Patrick of the Georgia Botanical Society, just to be sure, because I was suspicious they might not all be T. erectum - but came back with the same answer.The common Wakerobin has red petals and is known to most of us who have ever seen a Trillium. Trilliums are an area of active discussion among botanists. Depending on the book or source you go to, there are anywhere from 10 to 20 (and counting) species in our area. A good rule of thumb is that if it has an erect flower (not hanging below the leaves) and red ovary, it's Trillium erectum according to the more conservative sources. I've seen the variable cream/green/white ones both in the Standing Indian Basin (Nantahalas) and near Craggy Gardens (north of Asheville). Erect Trilliums bloom from late April through May, sometimes into June.