March, igoo. Plants Utowan^e Millspaugh. 13 



In the determination and classification of the species in the fol- 

 lowing catalogue, the herbaria at Columbia and Harvard Universities 

 were consulted by the author, and work in their special groups was 

 cheerfully undertaken by the following botanists : Prof. B. L. Rob- 

 inson, and Messrs. J*. M. Greenman and M. L. Fernald, of the Gray 

 Herbarium ; Profs. N. L. Britton and L. M. Underwood, Dr. 

 J. K. Small and Miss Anna Murray Vail, of the New York Botanical 

 Garden; Prof. F. Lamson-Scribner, and Mr. Charles L. Pollard, of 

 the United States National Herbarium ; and Mr. Geo. E. Davenport, 

 Mr. Edwin B. Uline, and Mr. J. B. Ellis, each of whom are credited 

 under the orders in which their aid was given. My thanks are due 

 to these botanists for their generous co-operation, and also to Prof. 

 Dr. I. Urban, of Berlin, for type portions of his Antillean species of 

 Euphorbia, and Prof. Dr. Anton Heimerl, of Vienna, for notes upon 

 the Nyctaginaceae. 



Chicago, January 20, 1900. 



