PREFACE. 



This paper, prepared by Dr. J. N. Rose in cooperation with J. A. 

 Purpus of the Darmstadt Botanical Garden, Germany, contains the 

 descriptions of three interesting new species of Echeveria from 

 southern Mexico. The beauty of two of these is such as to warrant 

 their introduction into ornamental cultivation along with many 

 other beautiful and striking species of Echeveria which have been 

 discovered in Mexico during the last few years. 



Frederick V. Coville, 

 Curator of the United States National Herbarium. 



