others but usually these prairies have been intensively 

 arazed' and Poa pratensis is the prevalent grass indicating 

 replacement "ol tho native species. Selagmella djmsa is 

 abSndSnt at some sites, which is probably also an indication 

 of heavy grazing. 



other sites are more open, with a sparse vegetative cover, and 

 de sandy "blowouts" and steep, rocky, gravelly mesa 

 slooes At one site ni nhanthel „am wilcoxianum is one of the 

 So? components of the sparse vegetation after a canopy- 

 removing wildfire. 



taxa includes: 



Hedeoma hispidum 

 Helianthus rigidus 

 Heterotheca villosa 

 Koeleria macrantha 

 Liatris punctata 

 Lygodesmia juncea 

 Oxytropis lambertii 

 Penstemon angustifolius 

 Phlox hoodii 

 Pinus ponderosa 

 Poa pratensis 

 P. sandbergii 

 Psoralea argophylla 

 Ratibida columnifera 

 Rosa arkansana 

 Selaginella densa 

 Smilacina stellata 

 Stipa comata 

 S. viridula 



Symphoricarpos occidental. 

 Taraxacum officinale 

 Tradescantia occidentalis 

 Tragopogon dubius 



A complete list of associated 



Achillea millefolium 



Agropyron smithii 



Allium textile 



Ambrosia psilostachya 



Andropogon scoparius 



Antennaria microphylla 



Aristida fendleriana 



A. campestris 



A. dracunculus 



A. frigida 



A. ludoviciana 



Asclepias stenophylla 



Aster falcatus 



Astragalus adsurgens 



Anemone patens 



Besseya wyomingensis 



Bouteloua gracilis 



Calamovilfa longifolia 



Carex pennsylvanica 



Cerastium arvense 



Dalea purpurea 



Echinacea angustifolia 



Eriogonum annuum 



Glycyrrhiza lepidota 



Agrostis scabra 



Danthonia intermedia 



2. Topography: The ni rhanthelium wilcoxianum occurs in a 

 variety of topographic positions including flat ridge and mesa 

 tops, upper steep mesa slopes (to 20 percent), and on 

 midsiopes, occasionally lower slopes of hillsides situated 

 mesas and ridges and within valley systems. Aspect varies 

 from open, to W, SW, SE, and NE. The elevation ranges from 

 1067-1043 m (3500 to 4800 ft), but within any one population 

 the range is very small, usually less than 10 m (31 it). 



3. Soil relationships: Most soils on hillsides and some mesa 

 tops are brown, sandy loam. Loamy sand is present in one 

 blowout, and gravelly, rocky sand is present on some mesa and 



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