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The Comps of Mexico is a long-running series of systematic accounts of all the tribes and genera of the family Asteraceae. Chapter 21 in this treatment deals with several subtribes, namely Zaluzaniinae (genera Hybridella and Zaluzania) and Zinniinae (genera Heliopsis, Philactis, Sanvitalia, Tehuana, Trichocoryne, and Zinnia).