Ambrosia tomentosa, the skeletonleaf bur ragweed, silverleaf povertyweed, or skeleton-leaf bursage, is a North American species of perennial plants in the (aster family). Skeletonleaf bur ragweed is native to the west-central part of the United States, primarily the western Great Plains, the Colorado Plateau, and eastern Great Basin. It is often found growing alongside roads and in the sandy parts of plains. It is considered a noxious weed in several states. It is also considered a severe allergen.