''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 plant ...

. 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