IOWA ACADEMY OF SCIENCES. 209 



Calamovilfa Hack. 



68. C longifolia (Hook.) Hack. {Calamcujrostis lonrji- 

 folia Hook). Rare in dry ground; just south of 

 state line on road to Iowa Lake from the south. 



Spartina Schreb. Tall Slough-grass. 

 61). N ci/Ho.s lira ides (L.) Willd. Very common on low 

 prairies, and one of our most valuable native 

 grasses. The long white rhizomes are very num- 

 erous, and are difficult to cut with the plow. 



Bouteloua Lag. Grama-grass. 



70. B olif/osiachya (Nutt.) Torr. Rare; dry ground near 



Estherville. 

 Atheropogon Muhl. 



71. A curtipendula (Michx.) Fourn. [Bouteloim ciirtipen- 



dtifa Torr). Common on upland prairies. 

 Phragmites Trin. Keed. 



72. P. phragmites (L) Karst. (P. communis Trin). Our 



tallest species of grass, everywhere common in 

 marshes. 

 Eragrostis Beauv. 



73. E. franJdi Steud. Local; north shore of Iowa Lake. 



74. E.purshii Schrad. Infrequent; shores of lakes and 



along roadsides where the seeds have probably 

 been carried by the wheels of vehicles. 

 lo. E. major Host. [E. po(eoides var megastacliija A. Gray.) 

 Introduced in cultivated ground. 



76. E hgpnoides (Lam.) B. S. P. (E. reptans Nees.) 



Common on river banks. 

 Eatonia llaf. 



77. E obfusata (Michx.) A. Gray. Common on dry 



prairies. 



78. E.pennsglvanicaiB.C.) A.Gray. Common in low 



ground and marshes. 



79. E. pennstjlvanica major Torr. Infrequent in low 



places. 



Koeleria Pers. 



80. K. cristata (L.) Pers. Very common on high prairies. 



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