Sacred Datura is a fascinating plant that is fairly common at some points in the canyon. The large flower opens only in the dark, mainly for the benefit of moths, then wilts in the early morning. As the notes indicate, it is a member of the nightshade family, so it is perhaps no surprise that just about every part of it contains a toxic hallucinogen. A guide told us a story of one man journeying down the river who made tea from the plant and was not right for the remainder of the trip. Apparently he was lucky, as the toxin can be quite deadly.