Hemizonia congesta subsp. tracyi Hemizonia congesta subsp. lutescens Hemizonia congesta subsp. clevelandii Hemizonia congesta subsp. luzulifolia Hemizonia congesta subsp. congesta Hemizonia congesta subsp. calyculata
Hemizonia leucocephala Hemizonia congesta var. congesta
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024