In accord with AOS-NACC, the monotypic group Broad-billed Hummingbird (Tres Marias Is.) Cynanthus latirostris lawrencei is elevated to species rank as Tres Marias Hummingbird Cynanthus lawrencei (Chesser et al. 2022). Tres Marias Hummingbird is genetically distinct, although levels of genetic differentiation are low (Hernández-Baños et al. 2020), and exhibits plumage differences that comparable to those between other species in the genus (Gómez de Silva 2020, Hernández-Baños et al. 2020)