51 
present river, and to the dry top of the second bluff. It is variable in its 
floristic content, but the following species are commonly found in it. 
Primary spp.: Stipa comata 
Koeleria cristata 
Secondary spp.: Elymus innovatus 
Agropyron trachycaulum var. unilatemle 
A. trachycaulum var, typicum 
A, Smithii var. molle 
Hierochloe odorata 
Poa pratensis 
P. glauca 
Danthonia intermedia 
Car ex obtusata 
Smilacina stellata 
Comandra pallida 
Stellaria longipes var. laeta 
Lychnis Drummondii 
Pulsatilla ludoviciana 
Anemone cylindriea 
Thalictrum venulosum 
Arabis hirsuta 
A . retrojracta 
Erysimum parviflorum 
Geum triflorum 
Potentilla pennsylvanica 
Vida americana 
Oxytropis splendens 
Hedysarum alpinum var. americanum 
Astragalus adsurgens 
A . tenellus 
Elaeagnus argentea 
Arctostaphylos Uva-urd 
Stachys scopulorum 
Galium boreale 
Campanula rotundijolia 
Achillea Millefolium 
Artemisia dracunculoides 
A. frigida 
Erigeron glabellus 
Aster ericoides 
In less dry areas there is an association dominated by the wheat-grass 
Agropyron trachycaulum var. unilaterale, and by an assemblage of peren- 
nial herbs of which Geum triflorum , Stachys scopulorum, Geum macrophyl - 
lum var. perincisum , and Galium boreale are the most prominent. Most of 
the secondary species are common to the drier places, so that only those 
that are characteristic will be listed below. 
Secondary spp.: Equisetum pratense 
Bromus Pumpellianus 
Schizachne purpurascens 
Calamagroslis inexpansa var. brevior 
C. montanensis 
Sisyrinchium angustifohum. 
Anemone multifida var, hudsoniana 
Rosa acicularis 
Lathyrus ochroleucus 
Monarda mollis var. menthaefolia 
Symphoricarpos ocddentalis 
Aster Lindleyanus 
Cirsium Drummondii 
Antennaria nitida 
