112 UNIVERSITY OF MISSOURI STUDIES [254 



231. J, aristulatus Michx. [/. marginatus aristulatus 

 (Michx.) Coville: J. ?narginatus biflonis Wood]. 



Marsh meadows; especially frequent in the region of the 

 waterworks dam: intermediate forms connect it with the 

 preceding. 



New York to Michigan; Florida to Texas and Mexico. 



232. J. tenuis Willd. 



Very common along paths, where it is apt to be depau- 

 perate, and in swales, where it is tall with an ample panicle. 

 North America, becoming cosmopolitan. 



232a. J. tenuis anthelatus Wiegand. 

 Swamps and swales; rare and local. 

 Maine to Missouri; South Carolina to Texas. 



233. J. dichotomus Ell. 



Low springy, but sterile places; frequent. 

 Maine and Florida to Missouri and Texas. 



234. J. effusus L. Soft rush. 



Swale near Wabash railroad north of Columbia; rare. 

 North America: Europe and Asia. 



235. J. acuminatus Michx. 



Swales and borders of ponds and lakes; common and va- 

 riable. 



Maine to Minnesota; Georgia and Texas to Mexico and 

 our northwestern coasts. 



235a. J. acuminatus legitimus Engelm. 

 Swales and flats. 

 Range of the type. 



236. J. scirpoides Lam. 



Margin of More's lake and the waterworks dam. 

 New York to Michigan; Florida to Texas. 



237. J. nodosus L. Knotted rush. 

 Limose banks of the Missouri at Rocheport. 



Nova Scotia to British Columbia; Virginia and Mis- 

 souri to Nebraska and Nevada. 



