Acourtia dugesii (A. Gray) Reveal & R. M. King var. veracruzana (B. L. Turner) Villarreal & A. E. Estrada, Acourtia dugesii (A. Gray) Reveal & R. M. King var. queretarana (B. L. Turner) Villarreal & A. E. Estrada and Chaptalia lyratifolia Burkart var. estribensis (G. L. Nesom) Villarreal & A. E. Estrada, are proposed as taxonomic rank changes and new nomenclatural combinations for three Mexican taxa of Compositae.
