A taxonomic review of Coulteria (Leguminosae) species present in the flora of Tehuacan-Cuicatlan Valley was carried out as part of the treatment of the subfamily Caesalpinioideae of this area. Coulteria rosalindamedinae is described and illustrated as a new species, it is endemic from the study area, and morphologically related to C. pumila. A comparative table, photographs of C. rosalindamedinae and C. pumila, are presented as well as key for their taxonomic identification.