''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 plants ...

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

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

Massachusetts Massachusetts (Massachusett language, Massachusett: ''Muhsachuweesut assachusett writing systems, məhswatʃəwiːsət'' English: , ), officially the Commonwealth of Massachusetts, is the most populous U.S. state, state in the New England ...

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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