Heterotheca villosa var. nana (A. Gray) Semple is a less-hairy more glandular race native to the western Great Plains and into the Rocky Mts. It has been treated as H. villosa var. horrida (Rydb.) Harms, a name that does not have nomenclatural priority, and as H. horrida Rydb.  It is a diploid taxon.

Heterotheca villosa var nana Fig 48 Semple 1996