Abstract
A new species of Lachemilla (Rosaceae), Lachemilla mexiquense D.F. Morales-B., from Mexico is described and illustrated. This species is similar to Lachemilla aphanoides by its tripartite leaves and glomerulate inflorescence with entirely glabrous flowers, but it differs by its stonoliferous habit, persistent basal leaves and basal stipules, and smaller flowers with a campanulate-elongate hypanthium and single carpel. A key to the species of Lachemilla in Mexico is provided.