Varieties may need checking in some cases. Before 1930 var. glandulissimum was largely restricted to rocky bluffs and streambanks in the Nashville Basin of c. Tenn. In recent decades it has spread across east-central states, especially along interstate highways (Semple 1983; FNA 21; W). The earliest record in Ky. was a coll. of B from MONR. Var. camporum is a much less weedy plant of rocky glades and prairies in n. Ark., e. Mo., Ill. and w. Ind. It is unknown in Ky., although the holotype is a coll. of C.W. Short (Univ. of Notre Dame) without clear provenance (M). There has also been confusion with H. villosa (Pursh) Shinners, with some authors using the combination H. villosa var. camporum (Greene) Wunderlin; typical villosa is a distinct western taxon that is unknown in Ky. (FNA 20).