''Ptilimnium'' is a group of

plant Plants are the eukaryotes that form the Kingdom (biology), kingdom Plantae; they are predominantly Photosynthesis, photosynthetic. This means that they obtain their energy from sunlight, using chloroplasts derived from endosymbiosis with c ...

s in the family

Apiaceae Apiaceae () or Umbelliferae is a family of mostly aromatic flowering plants named after the type genus ''Apium,'' and commonly known as the celery, carrot, or parsley family, or simply as umbellifers. It is the 16th-largest family of flowering p ...

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 only 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 foun ...

to the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

, primarily in the

Southeast The points of the compass are a set of horizontal, Radius, radially arrayed compass directions (or Azimuth#In navigation, azimuths) used in navigation and cartography. A ''compass rose'' is primarily composed of four cardinal directions—north, ...

, the

Lower Mississippi Valley The Mississippi River Alluvial Plain is an alluvial plain created by the Mississippi River on which lie parts of seven U.S. states, from southern Louisiana to southern Illinois (Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, L ...

, and the Lower

Great Plains The Great Plains is a broad expanse of plain, flatland in North America. The region stretches east of the Rocky Mountains, much of it covered in prairie, steppe, and grassland. They are the western part of the Interior Plains, which include th ...

.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 taxonomic database published by the Royal Botanic Gardens, Kew. History Following the Convention on Biological Diversity, the Royal Botanic Gardens in Kew launched Plants of the World Online i ...

accepted five species: * '' Ptilimnium ahlesii'' 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 ( ; ), officially t ...

'' (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 {{Apiaceae-stub