Many associate species of the Syoc-Rosa c.t. are found in the Shar/Syoc- 

 Rosa c.t. Other distinctive secondary species are Monarda fistulosa and 

 Rlbes_ aureum . Bromus inermis and Poa canbyi were sometimes present. 



Prunus virqiniana is co-dominant on the moister and/or most protected 

 sites. It was present in forty-eight percent of the reconnaissance plots 

 comprising the Shar/Syoc-Rosa c.t. P. virqiniana is susceptible to tent 

 catepillar infestation and grazing, while the well-armed S. argentea fre- 

 quently has a fungus pathogen. Porcupines may significantly damage all tall 

 shrubs (except S. argentea ) and trees. On the driest sites with S. argentea . 

 snowberry and rose may be absent; such communities are not members of this 

 type. 



With increasing moisture and protection, Cornus stolonifera , Rhus 

 radicans , Ribes spp. , and to a lesser extent Amelanchier alnifolia join 

 the Shar/Syoc-Rosa c.t. These highly diverse and productive communities, 

 both from a floristic and wildlife viewpoint seem to warrant recognition and 

 have been designated the C. stolonifera phase. The fauna, too, is diverse. 



Some moist site indicators were more abundant in the C. stolonifera 

 phase than in the rest of the Shar/Syoc-Rosa c.t. Some of these species are 

 Artemisia ludoviciana . Solidago riqida , Achillea millefolium , Glycyrrhiza 

 lepidota , Rhus radicans , Ribes spp. , and Prunus virqiniana . In contrast, 

 Melilotus spp. seldom occurred in the Cost phase, perhaps because of the 

 characteristically heavy grazing. Rhus radicans . Stipa viridula , Ribes spp., 

 and Rhus trilobata were present in all samples, and Elymus canadensis was 

 often present. 



A comparison of the Cost phase and the rest of the Shar/Syoc-Rosa c.t. 

 using Sorensen's index showed only a forty percent similarity. 



Fraxinus pennsylvanic^Rosa arkansana-Symphoricarpos occidental is Com- 

 munity Type^(Frpe/Rosa-Syoc c.t.) . A site description has not been worked 



jre areas, 

 productivity, 



-- -^,-- -- _, ..inson and 



Whitman (1938). 



munity Type (Frpe/Rosa-Syoc c.t.) . A site description has not beer 

 up for the Frpe/Rosa-Syoc c.t. which is clearly tied to high moistur 

 It is found along streams and in the moistest draws. Diversity, pre 

 and animal use are high. A Fraxinus-Acer type is mentioned by Hansc 



Many associates of the Syoc-Rosa and Shar/Syoc-Rosa c.t.s are found in 

 this type. Poa prat.pnsis often had modest coverage. Smilacina stellata 

 and Clematis lingusticifoli a were present in half the sample stands, as were 

 Taraxacum officinale and Rhus radicans . Ribes spp. was present in all 

 samples. Amelanchier alnifolia , Cornus stolonifera , Crataeg us douglasii , 

 Sheperdia argentea , Prunus virginiana , and Salix app. were often present. 



Populus deltoides/Rosa arkansana-Symphoricarpos occidentalis Community 

 Type (Pode/Rosa-Syoc c.t. ). The Pode/Rosa-Syoc c.t., chiefly found along the 

 Missouri River and a few other waterways, although scattered individuals oc- 

 casionally occurs in coulees. It can be identified by overstory dominance 

 of P^, deltoides , though ash may be a subdominant. Understory species com- 

 position varies due to land use, grazing, and flooding, which has been re- 

 duced by Fort Peck Dam. P. deltoides appears to be phreatophyte. 



34 



