Acta botánica mexicana
versión impresa ISSN 0187-7151
Perymenium ibarrarum and P. moctezumae are described as new and illustrated. The first one resembles and is possibly related to P. hintonii McVaugh; the second seems to be related to P. tamaulipense B. L. Turner and to P. sotoarenasii Rzed. & Calderón. Both are only known from the type collections.
Palabras llave : Compositae; México; Perymenium; taxonomy.