The Pode/Rosa-Syoc c.t. often shares some secondary species with the ■ 

 Syoc-Rosa, Shar/Syoc-Rosa, and Frpe/Rosa-Syoc c.t.s, Rhus radicans was 

 sometimes an understory co-dominant, and Glycyrrihiza lepidota and Elymus 

 canadensis often attained most coverage with the microphanerophytes, only 

 Salix spp. , Shepherdia arqentea , and Prunus virginiana were often present. 

 The introduced species, Bromus inermis , Agropyron intermedium and Mel i lotus 

 officinal is , were also often present. 



SPECIES COMPOSITION 



Species composition of the community types is summarized in Appendix A. 

 Only species with an average coverage of more than one tenth of one percent 

 are listed. 



Many species play a dominant role in some communities and a secondary 

 role in others. Examples of this behavior are Agropyron smith ii , Calamovilfa 

 longifolia , Distichlis stricta , Agropyron spicatum , Andropoqon scoparius , 

 Bouteloua gracilis, Carex fil ifolia , Koeleria cristata , Stipa comata , Stipa 

 viridula , and Artemisia cana. Other species are typically present in modest 

 quantities in a number of community types. Some species exhibiting this 

 behavior are Tragopoqon dubius , Sphaeralcea coccinea , Polygala alba , Artemisia 

 frigida , Gutierrezia sarothrae , Opuntia polyacantha , Phlox hoodi i , and Rhus 

 trilobata . 



These species have some indicator value, especially when abundant, but 

 they also have a rather broad ecological amplitude. Some of the more 

 interesting and less ubiquitous associates of the community types are 

 mentioned in the section on community types. 



35 



