Pharmacopoeia listed eastern skunk cabbage as the drug "dracontium". Hardly 20% are herbaceous perennials, which are often in the sections "Dracontium" and "Neodetris". The genus is closely related to both "Urospatha" and "Dracontium". Species in the sections "Lignofelicia", "Anhebecarpaea" and "Dracontium" never have opposite leaves. In fact, "A. macrophyllum" has sometimes been considered a subspecies of "A. dracontium". When "Dracontium" plants begin to flower, the tuber swells and smoothens. Dracontium spruceanum is a tropical flowering plant species of the Amazon rainforest understory. Dracontium is a genus of flowering plants similar to those of "Amorphophallus".