I am confused about the species Euphorbia heterophylla and Poinsettia cyathophora. I have seen a number of websites that list them as synonyms of each other, implying that they are in fact the same species. But I have seen other websites that discuss them as though they were different species. Can anyone clear this up for me. I recently saw a species in Bermuda that was one or the other of these species, and I also saw one at the LA Arboretum that was not signed.