Bulletin No. 18. Agros.46. 



U. S. DEPARTMENT OF AGRICULTURE. 



DIVISIOX OF AGROSTOLOGY. 



[Orasiii and l^'orajg*- I'Isiiil I ■■rcNti;:alioii)<.] 



AMEEICAN GEASSES. 



A SYNOPSIS OF THE GENUS SITANION. 



BY 



JAREE) G^. SMITH. 



PREPARED UKDER THE DIRECTION OF E. LAMSONSCRIBXER, AGROSTOLOGTST. 



ISSXJIl:!) JUISTK 2 t, 1800. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1899. 



