''Ptilimnium'' is a group of

plant Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclud ...

s in the family Apiaceae described as a genus in 1819.Tropicos, ''Ptilimnium'' Raf.
/ref> The common name is mock bishopweed or mock bishop's weed. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

, primarily in the Southeast, the Lower Mississippi Valley, and the Lower

Great Plains The Great Plains (french: Grandes Plaines), sometimes simply "the Plains", is a broad expanse of flatland in North America. It is located west of the Mississippi River and east of the Rocky Mountains, much of it covered in prairie, steppe, an ...

.Biota of North America Program 2013 county distribution maps
/ref>

Species

Plants of the World Online Plants of the World Online (POWO) is an online database published by the Royal Botanic Gardens, Kew. It was launched in March 2017 with the ultimate aim being "to enable users to access information on all the world's known seed-bearing plants by ...

accepted five species: * ''

Ptilimnium ahlesii ''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, an ...

'' Weakley & G.L.Nesom * ''

Ptilimnium capillaceum ''Ptilimnium capillaceum'', known by the common name of herbwilliam, is a member of the carrot family, Apiaceae. It is a perennial herb, native to the eastern United States, from Texas to Massachusetts Massachusetts (Massachusett language, ...

'' (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 ''Harperella'' is a monotypic genus of flowering plants in the family Apiaceae. Its only species is ''Harperella nodosa'' (synonym ''Ptilimnium nodosum''), known as piedmont mock bishopweed and harperella. It is native to riparian environments in t ...

'' 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 {{Apiaceae-stub