Like all trilliums, its parts are in groups of three, with 3-petalled flowers above whorls of pointed triple leaves. The flowers are a deep red colour, though there is a white form. The carrion-scented flowers attract scavenging flies for pollination. Eventually the flower petals wither, leaving behind a fruit, which is initially green, ripening to a bright red berry-like capsule, 1 to 1. 5 centimeters long.