I02 UNIVERSITY OF MISSOURI STUDIES [^44 



156. O. strigosus L. 



Low meadows and swales; very common and variable. 

 Maine to Nebraska; Florida to Texas. 



156a. O. strigosus capitatus Boeckl. 

 Dry banks; rare. 

 Range of the type. 



iS6b. O, strigosus compositus Britton. 

 Frequent in rich alluvial meadows. 

 New York to Alabama; Missouri and Iowa. 



156c. O. strigosus robustior Kunth. 

 Rich lowlands; frequent. 

 Range of the type. 



i56d. O. strigosus elongatus (Torn) Britton. 

 Damp places; frequent. 

 North Carolina to Missouri and Texas. 



66. KYLLINGA Rottb. 



157. K. pumila Michx. 



Local in alluvial flats and low pastures. 



Virginia and Michigan to Missouri; Florida to Texas. 



67. ERIOPHORUM L. [SCIRPUS L.]. Cotton 



GRASS. 



158. E. lineatum (Michx.) Benth. & Hook. [5. lineatus 

 Michx.]. 



Common along streams and in swales and swamps: a 

 form with remarkably long spikelets occurs in Hinkson 

 creek in shallow water. 



Ontario to Oregon; Georgia to Texas. 



68. SOIRPUS L. Bulrush. 



159. S. Americanus Pers. [5. pungensN^kA^. Three 



SQUARE. 



Common in shallow waters and on muddy shores. 

 North America: Chile: Europe. 



