vegetation. Bare ground is above 60 and usually closer to 90 

 percent, while graminoid cover usually ranges from 3 to 20 

 percent. Shrub cover is absent or minimal. 



The surrounding vegetation is generally mixed-grass prairie 



grading into little bluestem grassland. Graminoid cover is 



provided by patches (usually) of Carex f ilifolia , Bouteloua 



gracilis , and scattered Andropogon scoparius and Calamovilfa 



longifolia in some sites. Typical scattered forbs include 



Helianthus rigidus , Artemisia campestris . Tradescantia 



occidentalis , and Heterotheca villosa . Yucca glauca is 



occasionally present. A complete list of associated taxa 



includes: 



Agropyron smithii 



A. spicatum 



Andropopgon hallii 



A. scoparius 



Artemisia campestris 



A. frigida 



Asclepias pumila 



A. stenophylla 



A. viridiflora 



Astragalus ceramicus 



A. flexuosus 



Bouteloua gracilis 



Calamovilfa longifolia 



Calochortus nuttallii 



Carex filifolia 



Dichanthelium wilcoxianum 



Eriogonum annuum 



E. flavum 



Helianthus rigidus 



Heterotheca villosa 



Koeleria macrantha 



Lesquerella ludoviciana 



Lithospermum incisum 



Lygodesmia juncea 



Melilotus officinalis 



Orobanche fasciculata 



0. ludoviciana 



Oxytropis lambertii 



Petalostemon purpureum 



Pinus ponderosa (isolated trees, saplings) 



Poa sandbergii 



Psoralea argophylla 



P. esculenta 



Rhus trilobata 



Rosa arkansana 



Selaginella densa 



Stipa comata 



Tradescantia occidentalis 



Yucca glauca 



38 



