pedatifida/Atriplex nuttallii but a similar type under the 

 former name has been described for Wyoming. There appear to 

 be two phases of this type in the study area: Atriplex 

 nuttallii phase in the eastern portion of the study area and 

 the Agropyron smithii phase in the west part. 



20. Artemisia tridentata/ Agropyron smithii c.t. G5/S5 



21. Artemisia tridentata/ Agropyron spicatum c.t. G5/S5 



22. Artemisia tridentata/ Atriplex confertifolia c.t. G4/S4 



23. Sarcobatus vermiculatus/ Artemisia tridentata c.t. G4/S4. 

 Typical examples of this community type occur in silty soil 

 along stream terraces. However, there are stands dominated 

 by Sarcobatus vermiculatus , Artemisia tridentata and Grayia 

 spinosa on sandy calcareous soils east of Warren and just 

 north of the Wyoming border. These unusual associations may 

 warrant recognition. 



24. Artemisia tridentata /Stipa comata c.t. G4/S4 



25. Atriplex nuttallii /Artemisia spinescens c.t. Gl/Sl 



26. Artemisia tridentata/ Atriplex nuttallii c.t. G37/S3? 



27. Atriplex nuttallii /Monolepis nuttalliana c.t. G37/S2. This 

 community occurs on barren bentonitic soils, usually in a 

 mosaic of badlands community types. It is difficult to 

 determine its relationships to similar community types in 

 the intermountain region. 



28. Potentilla fruticosa/Festuca idahoensis c.t. G4/S3 



29. Sacrobatus vermiculatus /Atriplex nuttallii c.t. G4/S3. 

 This community usually occurs in a mosaic of badlands 

 community types. 



30. Agropyron spicatum/ cushion plant c.t. G3/S3 



31. Chrysothamnus nauseosus/Eriogonum brevicaule c.t. G2/S2 



32. Festuca idahoensis /Agropyron caninum c.t. G4/S4 



33. Carex rupestris/ Potentilla ovina c.t. G4/S3. This type has 

 very limited distribution in the study area. 



Eleven Community types in the study area are ranked G3 , S2 

 or higher. These rare community types, their ranks and the 

 estimated acreage for each in the study area are given below: 



