174 XATUEAL HISTOEY BULLETIN 



and western parts," and the vicinity of Roland in Story county^ 

 both in the Wisconsin area. 



2. The rolling prairie : Johnson county, near Iowa City, and 

 the northwestern part of Lyon county north and northeast of 

 Granite. Both are loess-Kansan and the latter is somewhat 

 rougher. 



3. The western ridges : the loess ridges of Harrison county and 

 the Wisconsin hills of southwestern Lyon county. While they 

 are unlike geologically they are very similar in their rough topog- 

 raphy and their flora. 



4. The alluvial prairie : Harrison county, in the Missouri val- 

 ley, and the valley of the Iowa river in Johnson county, and the- 

 adjoining part of Iowa county. 



5. The prairie openings : Johnson county, north of Iowa City,. 

 and Winneshiek county along the Upper Iowa river. 



6. The sand-dunes : Muscatine county, south of Muscatine, 

 and the western part of Harrison county. 



It should be noted that too much emphasis should not be placed 

 upon relative abundance of individuals of species as this varies 

 in different localities and in different seasons. 



The following list contains the typical prairie plants of 

 Iowa : 



it "■- '^ S .2 V 



^ ~ S '5 c > "o =j 



"S = - Si' 3 cc 



&< M i3 OiO <! t»0 



I II III IV V VI 



Acerates floridana (Lam.) Hitch eE eJ eH — — — 



Acerates viridiflora (Eaf.) Eaton — eJ eH — — eM 



Acerates viridiflora lanceolata (Ives) 



Gray e e eJ eM 



Acerates viridiflora linearis Gray — — f — — 



Achillea minefolium L c e cL c c cM 



Agoseris cuspidata (Pursh) Steud c cH — — 



Agropyron Smithii Eyd d dL — d J d dM 



Agrostis alba vulgaris (With.) Thurb — — c c cM 



"The Emmet county list is made up in large part of plants collected by 



the writer but additional information was secured from Mr. E. I. Cratty's. 

 collection. 



