communication; Appendix A). The plant is also known from Big 

 Horn and Sheridan counties. Wyoming (Dorn 1988) 



2. RECENTLY VERIFIED SITES: There are 41 documented 

 locations for E. la gopus in the Pryor Mountain Desert area south 

 and west of the Pryor Mountains in southern Carbon County. 

 Montana (Figure 1). Most of these were recorded during a floristic 

 study of this area in 1991 (Lesica and Achuff 1992). Lichvar et al. 

 (1984) report that the plant is frequent on Bighorn Canyon National 

 Recreation Area in Big Horn and Carbon counties, Montana and 

 Big Horn County, Wyoming. Although these researchers did not 

 map locations for the species, they undoubtedly collected a number 

 of specimens that would vouch for populations in their study area. 

 Exact locations of known populations are in Table 1. 



3. HISTORICAL SITES: The Yellowstone County. Montana 

 collection was made in 189() and the population has not been 

 relocated. The Park County. Montana collection was probably made 

 in the early 19()()'s and has not been relocated. 



HABITAT 



1. ASSOCIATED VEGETATION: Eriononum lagc^pus always occurs 

 on sparsely vegetated sites. Al the north end of the Bighorn Basin 

 in Montana, it can be found in many different plant associations. It 

 is most common in cushion plant grasslands dominated by 

 Ceratoides lanatus. Gutierre^ia sar(^thrae . Chr\sothamnus nauseosus . 

 Agropyron spicatum and Phlox spp. It can also be found in desert 

 shrub communities including Artemisia arhuscula - Agropvron 

 spicatum . Artemisia tridentata - Agropvron spicatum . and Atriplex 

 confertifolia - Chrysothamnus nauseosus types. Occasional 

 populations occur in open Utah juniper woodlands ( Juniperus 

 osteosperma/Agropvron spicatum ). Other common associates 

 include Arenaria hookeri . Astragalus adsurgens , A^ spatiilatus . 

 Crvptantha cana , Hvmenoxvs acaulis . Machaeranthera grindelioides 

 and Senecio canus . 



2. TOPOGRAPHY: Eriogonum lagopus is most often found on 

 moderate to steep slopes; however, it is also common on wind-swept 

 ridge tops. 



Known sites in Carbon County, Montana range in elevation from 

 4,200 to 6,500 feet. Most sites are below 5,000 feet. 



