CONTENTS. 



Page. 

 Introductory statement 5 



Inventory 10 



Index of common and scientific names 53 



ILLUSTRATIONS. 



Page. 

 Plate I. A new food plant, the huauhtzontli of Mexico. {Chenopodium 



nuttallvae Safford, S. P. I. No. 46956) 12 



II. A striking subshrubby morning-glory from Brazil. {Ipomoca 



nstulosa Mart., S. P. I. No. 46966) 12 



III. A field of molasses grass in Brazil. (Melims minutiflora Beauv., 



S. P. I. No. 47162) 36 



IV. A new relative of the chayote, the tacaco of Costa Rica. {Pola- 



kowsUa tacaco Pittier, S. P. I. No. 47329) 36 



3 



