Ptilimnium is a group of plants in the family Apiaceae described as a genus in 1819. The common name is mock bishopweed or mock bishop's weed. It is endemic to the United States, primarily in the Southeast, the Lower Mississippi Valley, and the Lower Great Plains. Species , Plants of the World Online accepted five species: Ptilimnium ahlesii Weakley & G.L.Nesom Ptilimnium capillaceum (Michx.) Raf. - SE + SC + NE USA Ptilimnium costatum (Elliott) Raf. - SC USA Ptilimnium nuttallii (DC.) Britton - SC USA Ptilimnium texense J.M. Coult. & Rose - Texas, Louisiana, Florida Ptilimnium nodosum (Rose) Mathias, native to Georgia and South Carolina, is treated as Harperella nodosa by Plants of the World Online. References Apioideae genera Endemic flora of the United States Flora of the Southeastern United States Flora of the South-Central United States Flora of the Great Plains (North America) Taxa named by Constantine Samuel Rafinesque