Vegetation studies involving ecodata sampling have been done on the District, and the composite 

 species lists from the plots contribute to the tlora (Hansen and Hoffman 1987), as does a 

 preliminary vascular species list compiled in studying big game carrying capacity on the District 

 (Taylor no date). The only other floristic references on hand for this study are based on 

 incomplete distribution information presented in Booth (1966, 1959) and a floristic checklist for 

 Rosebud County (anon, no date). The primary focus of these efforts has been in documenting the 

 common species rather than the entire flora across the array of habitats. 



Only one species tracked by Montana Natural Heritage Program was known from the District 

 prior to this study. Astragalus barri. The CCC made 126 collections in the District in the 1930s 

 that are on file at the District Office, in five volumes under the heading "A Book of Important 

 Range Plants." Among this set was a specimen of Carex gravida, a Montana Plant Species of 

 Special Concern which was relocated at or near the original collection area during this study. 

 The YCC set of collections was not fully available for re\'iew until after the fieldwork, and 

 review of its list of specimens raised many important questions that are to be pursued in 

 fieldwork and taxonomic consultation. The list includes tliree more rare species that are tracked 

 by Montana Natural Heritage Program and not previously known from the District. Among 

 these three, it is highly unlikely that the Aqidlegia formosa specimen is correctly identified based 

 on its known range and habitat requirements. Review of all three specimens is recommended, 

 including: 



Aqidlegia formosa 



Cypripedium calceolus var. parviflorum 



Mentzelia mtda 



Three of the taxa are potential new additions to the state flora. The Elymus ambigitus has been 

 reported before in the state (Hitchcock 1973) but there are no known specimens as vouchers 

 (Dom 1984). Verificafion of all tliree is recommended. They include: 



Aster porteri 

 Elyhordeum x moiitanse 

 Elymus ambiguus 



Five more species collections are labeled with names that have no published synonymy in 

 Kartesz (1994). They, too, warrant review and verification by taxonomic researchers. 



Anaphalis subalpina 

 Astragalus hylophilus 

 Lupinus pseudoparvi/Iorus 

 Solidago concinna 

 Tradescantia larimiensis 



