Abstract
This paper revises the Mexican and Central American species of Heteromeles M. Roemer and Photinia Lindley (Rosaceae, subfamily Maloideae). One genus, Heteromeles, is monotypic, whereas in Photinia five species are recognised. Of the Photinia species, one, P. mexicana, is highly distinct and the remainder are closely related to, or part of, the P. microcarpa complex. A numerical taxonomic study has been conducted to assist in differentiating the last-named group of taxa. One new species, Photinia guerreris, and two new subspecies of Photinia microcarpa, sspp. elliptica and hintonii, are described. In Photinia microcarpa ssp. hintonii a new variety, var. brevis, is created. Key words: Heteromeles, Photinia, Rosaceae, taxonomy, Mexico, Central America.
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