GLOBAL DISTRIBUTION: South-central Montana to eastern Utah, south to Arizona 

 and New Mexico. 



MONTANA DISTRIBUTION: Southern Carbon County 



PRYOR MOUNTAINS DESERT DISTRIBUTION: Platyschkuhria integrifolia is 

 abundant below 1525 m (5000 ft) on the south and west sides of the Pr}or Mountains in 

 the drainages of the Bighorn and Clarks Fork of the Yellowstone rivers. It occurs in 

 sandy or, more often, sandy clay or clay soils, often in plant communities associated with 

 saline soils and dominated by Artemisia pedatifida . A, tridentata and Atriplex gardneri . 



MANAGEMENT RECOMMENDATIONS: We located 58 populations of R integrifolia 

 in the study area. The species is abundant throughout much of the study area and 

 should not be given special status on BLM's Miles City District. 



Sphaeromciia capitata Nuttall 



Rock Tansy, Cluster-headed Tansy 



NATURAL HERITAGE PROGRAM STATUS: G5/S3 



MONTANA STATUS: Limited Distribuiion 



GLOBAL DISTRIBUTION: Southern Montan:i. Wyoming and southeast Utah 



MONTANA DISTRIBUTION: Beaverhead and Carbon counties 



PRYOR MOUNTAINS DESERT DISTRIBUTION: Sphaeromeria capitata is common 

 between 1370 and 1980 m (4500 and 6500 ft) on the south and west slopes of the Pryor 

 Mountains. It occurs in shallow, limestone-deri\cd soils in exposed locations in juniper 

 and mountain mahogany woodlands and cushion plant grasslands, often with Cera to ides 

 lanatus and Agropvron spicatum . 



COMMENTS: Some authorities consider Tanacetum capitatum (Nuttall) T. & G. to be 

 the correct name for this species. 



MANAGEMENT RECOMMENDATIONS: Sphaeromeria capitata occurs throughout 

 the foothills and lower mcmtane slopes in ihe study area. We located 16 populations 

 during our study and most of these were huge. Its low cushion-like growth form curtails 

 damage from grazing. This species shouki not be given special status on BLM's Miles 

 City District. 



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