208 IOWA ACADEMY OF SCIENCES. 



MuHLENBERGiA Schreb. 



55. J/, mexivana (L.) Trin. Common, woods and 



prairies. 



56. M. ravemosa {Wiohx.) B. S. P. [Muhlenberf/ia (jhni- 



erata Trin.) Common and quite difficult to sub- 

 due in low ground. 

 Phleum L. Timothy. 



57. F. pratense L. Escaped from cultivation. 

 Alopecurus L. Marsh Fox-tail. 



58. A. fulvus Smith. Rare in marshes; the common 



eastern species, A. geniculatus L. has not been 

 detected within our limits. 

 Sporobolus R. Brown. Rush-grass. 



59. S. neglectus Nash. Very common in pastures, 



where it is utterly worthless, never being eaten 

 by cattle. 



60. S. cuspidatns (Torr.) Wood. A slender species, 



quite common on dry knolls. 



61. S. cryptandrus (Torr.) A. Gray. Rare, east bank 



of Iowa lake, and bank of Des Moines at Esther- 

 ville. 



62. S. heterolepis A. Gray. A valuable bunch grass, 



common on high prairies; called wire-grass by 

 haymakers, because the wirey culms when ma- 

 ture are difficult to cut with the mower. 

 CiNNA L. Wood Reed-grass. 



63. C. arnndinacea L. Low ground in woods; Iowa 



Lake. 

 Agrostis L. 



64. A. alba L. (.1. vulgaris With.) Red-top. Natural- 



ized from Europe. 



65. A. liyemalis (Walt.) B. S. P. [Agrostis scahra 



Willd.) Hair-grass. Common on low prairies. 

 Calamagrostis Adans. 



66. C canadensis (Michx.) Beauv. Common, and very 



variable. 



67. C. conjinis (Willd.) Nutt. Common on low prairies. 



