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.
Description P. capillaceum range between 1 and 8 decimeters (approximately 4 and 31 inches) in height. Leaves are pinnate.Radford, Albert E., Harry E. Ahles, and C. Ritchie Bell. Manual of the Vascular Flora of the Carolinas. 1964, 1968. The University of North Carolina Press. 784. Print.
Distribution and habitat This species' range encompasses eastern and central United States, stretching westward to Texas and south to Florida's Miami-Dade and Collier counties.
Within the United States' southeastern coastal plain, P. capillaceum occurs in wiregrass and slashpine habitats, flatwoods, and hammocks of various types. It grows in both shady and full sun location. Soil preferences range, including loamy sand, peaty soil, and clay.Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: November 2015. Collectors: William P. Adams, Loran C. Anderson, Kurt E. Blum, Dave Breil, Sidney T. Brinson, G. Fleming, P. Genelle,, C.S. Gidden, R.K. Godfrey, Darren Jackson, D.E. Kennemore Jr., G. Knight, Mabel Kral, R. Kral, Robert J. Lamaire, S.W. Leonard, Sidney McDaniel, William Lindsey,W. Miley, Marc Minno, Richard Mitchell, John B. Nelson, Elmer C. Prichard, Ronald A. Pursell, Gwynn W. Ramsey, P.L. Redfearn Jr., A. Redman, Grady W. Reinert, V. Rosario, Cecil R. Slaughter, Bian Tan, D.B. Ward, S.S. Ward, Jean W. Wooten. States and Counties: Florida: Alachua, Bradford, Brevard, Calhoun, Charlotte, Citrus, Columbia, DeSoto, Dixie, Escambia, Franklin, Hamilton, Hernando, Jackson, Jefferson, Lafayette, Leon, Liberty, Madison, Nassau, Okaloosa, Orange, Polk, Putnam, St. Johns, Sumter, Suwannee, Taylor, Union, Volusia, Wakulla. Georgia: Thomas.
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