''Ptilimnium capillaceum'', known by the common name of herbwilliam, is a member of the carrot 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 ...

. It is a perennial herb, native to the eastern United States, from

Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...

Massachusetts Massachusetts ( ; ), officially the Commonwealth of Massachusetts, is a U.S. state, state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode ...

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* * capillaceum Flora of the Southeastern United States Flora of the South-Central United States Flora of the Northeastern United States Plants described in 1803 Plants described in 1830 {{Apiaceae-stub