o<5 4 NATURAL HISTORY BULLETIN. 



Rare in sloughs and on the margins of ponds and lakes. 

 Not before reported from Iowa. This sedge usually grows in 

 dense tufts, erect, 6 to 18 inches high, but numerous clumps 

 with prostrate culms 2 feet long were found growing with the 

 type one mile east of Armstrong, July, 1896. This plant 

 seems to thrive best on land which is flooded during the spring. 



Emmet county, July 12, 1891, Cratty; Spirit Lake, July 30, 

 1896, Cratty & Shimek. 



Appendix. 



Since the manuscript for this paper was placed in the hands 

 of the printer considerable material, illustrating geographical 

 distribution, has been received which it is desirable to include. 

 Owing to a misunderstanding regarding the scope of the paper, 

 a considerable amount of material belonging to the genera 

 preceding Carex. was not placed in my hands in time to insert 

 the data in the proper place in the body of the paper. The 

 greater portion of the material here used was collected by 

 Prof. Shimek of the Iowa State University, and by Prof. C. 

 R. Ball of the State College of Agriculture, to both of whom 

 I am deeply indebted for the generous assistance they have so 

 freely given me. 



It has been found necessary to withhold a small amount of 

 material for further study and observation. 



P. 318. 



Cy-perus rivularis Kunth; Forest City, 1895, and Johnson 

 county, July, 1895, Shimek. 



P. 319. 



C. inflexus Muhl.; Johnson county, Sept. 1894, Shimek. 



P. 319. 



C. sdiweinitzii Torr. ; Muscatine, Oct., 1896, Clear Lake r 

 Cerro Gordo county, July, 1896, and Johnson county, 1894, 

 Shimek ; Jackson county, 1895, P. Bartsch; Winneshiek county. 



