90 UNIVERSITY OF MISSOURI STUDIES f^S' 



64. S. verticillata (L.) Beauv. \Chaetochloa verticillata (L.) 

 Scribn.: /. verticillaius {L-) Nash: Chamaeraphis verticil- 

 lata (L.) Porter]. Rough foxtail. 



Rare in waste places. 

 Europe, thence cosmopolitan. 



28. CENOHRUS L. Bur grass. 



65. O. tribuloides L. Sand bur. 



Rare along the Wabash R. R.; also in the sandy flats of 

 Grindstone creek. 



New England to California: also in many tropical lands. 



29. LEERSIA Swartz \_HOMALOCENCHRUS 



Mieg.]. 



66. L. Virginica Willd. [H. Vir^nicus (Willd.) Britton]. 

 White grass. 



Alluvial woods and wet places; common. 

 Maine to North Dakota; Florida to Texas. 



67. L. oryzoides (L.) Swartz [//". oryzoides (L.) Mieg.]. 

 Rice cut-grass. 



In streams and wet swales. 



Nova Scotia to Washington; Florida to California; 

 South America: Europe and Asia. 



30. ARISTIDA L. Triple-awned grass. 



68. A. basiramea Engelm. 



Red clay hill south of Columbia; scarce. 



Manitoba to Illinois; Virginia to the Indian Territory. 



69. A. oligantha Michx. Poverty grass. 

 Open sterile places and dry roadsides; common. 

 New Jersey and Mississippi to Nebraska and Texas. 



31. MUHLENBERGIA (MUEHLENBERGIA) 



Schreb. Dropseed grass. 



70. M. sobolifera (Muhl.) Trin. Common dropseed. 

 Rocky woods and waysides; common. 



New England and Minnesota to Virginia and Texas. 



71. M. Mexicana (L.) Trio. Mexican dropseed. 

 Borders of swales and in moist ravines. 



New England and North Carolina to South Dakota, 

 Indian Territory and Mexico. 



