Pycnanthemum pilosum Nuttall. Phen: Jul-Sep. Hab: Upland woodlands. Dist: S. ON west to MI and IA, south to TN, AR, and OK. In c. TN, and reported from a single county in e. TN (Chester, Wofford, & Kral 1997), in se. PA (Rhoads & Klein 1993), and WV (Kartesz 1999).
ID notes:P. pilosum differs from P. verticillatum in having the stems thickly (vs. thinly pubescent), the lower surface of the leaves evenly pubescent (vs. pubescence chiefly restricted to the midrib).
Origin/Endemic status: Native
Synonymy: = Ar, F, G, GrPl, K4, Mi, Tn; = Koellia pilosa (Nutt.) Britton – S; = Pycnanthemum verticillatum (Michx.) Pers. var. pilosum (Nutt.) Cooperr. – C, K1, K3, NE, NY, Pa; < Pycnanthemum verticillatum (Michx.) Pers. – Il