292 THE STUDY OF PLANT COMMUNITIES • Chapter X 



FlG. 155. Tall grass, or true prairie, community in which Andropogon 

 scoparius, Bouteloua gracilis, and Sporobolus heterolepis are the most impor- 

 tant species.— Photo by R. B. Livingston. 



The long list of major dominants includes tall grasses, such as 

 Stipa spar tea, Andropogo?i furcatus, and Sorghastrum nutans; 

 medium grasses, such as Andropogon scoparius and Bouteloua 

 curtipendula; and the short grasses, Bouteloua gracilis and B. hir- 

 suta. The association of dominants with topography should be in- 

 dicated at some point even though it is impossible to recognize it 

 throughout our discussion. The following groupings are not un- 

 common for Tall Grass Prairie. 



UPLANDS 



Agropyron repens 

 Bouteloua gracilis 

 B. curtipendula 

 Andropogoji scoparius 

 Poa pratensis 

 Sorghastrum nutans 



SLOPES 



LOWLANDS 



Poa pratensis 

 Sorghastrum nutans 

 Koeleria cristata 

 Andropogon furcatus 

 Stipa spartea 



Poa pratensis 

 Sorghastrum nutans 



Andropogon furcatus 



Agrostis alba 

 Spartina pectinata 

 Panicum virgatum 



