Heterotheca oregona (Nutt.) Shinners is a rayless species native to Cascade Mts. and Coastal Ranges from Washington south to central California. The species is diploid (2n=18). See Semple (2006 FNA).
Four varieties were recognized by Semple et al (1988) and Semple (2006):
- var. compacta (D.D. Keck) Semple
- var. oregona
- var. rudis (Greene) Semple
- var. scaberrima (A. Gray) Semple