ILLUSTRATIONS. 



Page. 



Plate I. Sitauion villosum J. G. Smith. Type 11 



II. Sitiinion bystrix (Nutt. ) J. G. 8initb. Photograph of Nuttall's 



type in the Herbarium of the Philadelphia Academy of Science... 15 



III. Sitanion lirevifoliiim ,1. (i. .Smith. Typical 17 



IV. Sitanion anoinalnm J. G. Smith. Cotyjie 20 



8 



