For the uninitiated, here's a quick bit on trillium stems. Or the lack of them. Trilliums can be conveniently divided into two groups, sessile and petioled. In other words, stemless and stemmed. Many of them, like the airplane propeller, have no stem between leaves and flowers. Gives them an unusual and interesting appearance. Others, like sweet Beth here, have a stem between the leaves and flowers. This difference is the first choice you come to in Trillium identification keys. Among all trilliums, there is only one species that can't decide, so this key works pretty well.