Do you have pictures and/or sources for Black Trilliums?
Other than references for the fantasy novel series Trillium (Black Trillium, Blood Trillium, Golden Trillium, Lady of the Trillium and Sky Trillium), Mr. Smarty Plants hasn't been able to find much about black trilliums. One person commenting in the UBC (University of British Columbia) Botanical Garden Forum says that they have seen black trilliums in Ontario, Canada, but wonders if they were so red that they appeared black. Another participant in the forum believes that the anthocyanins responsible for the petal color can be so concentrated as to cause them to look black. I suspect that this is the explanation for the black trillium, plus the fact that the blossoms darken as the flowers age. The species this person in the forum refers to is Trillium erectum (red trillium) (with more photos from CalPhotos).
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