Vascular Plant Collections 



Appendices A and B list all species of vascular plants which have been ob- 

 served in the study area through 1981. A single specimen of Rorippa calycina 

 yar, calycina (now housed at the University of Montana herbarium) was collected 

 in August 1980 by Rich Prodgers near a large stockpond approximately one mile 

 southwest of the Dreyer Brothers' ranchhouse. This area and similar habitat 

 was searched for R. calycina by R. Prodgers and D. Ramsden, DNRC contractors, 

 and B. Lichtvar, botanist for the Wyoming Heritage Program, during the summer 

 of 1981. No further specimens, however, were found. The occurrence of this 

 species IS rare. It is known from limited sites: three in Montana, one in 

 the Northwest Territories, Canada, and several in Wyoming. A healthy population 

 currently exists at Seminoe Reservoir, Wyoming, which appears to be the distri- 

 butional center and primary seed source for the species (B. Lichtvar, personal 

 communication). R. calycina is apparently a fugitive species, transported by 

 waterfowl but seldom establishing a viable population. The specimen obtained 

 tn the study area may represent an individual occurrence of R. calycina rather 

 than an established population, since a careful search failed to provide addi- 

 tional specimens. 



TABLE 14. Species Density 



Average Species Species per 



Community per O.lm^ plot 20 plots 



Dist 

 Bogr 



Bogr/Agsm 3.0 8 



Stco/Bogr-Cafi 3.6 g 



Arca/Agsm/Bogr 

 Agsm/Bogr 



Dist-Agsm 

 Ansc 



Stco-Agsm/Bogr 



2 



5 



14 

 7 



Bogr-Cafi/Stco 4.4 jq 



17 



29 



Agsp/Bogr-Cafi 6.4 14 



15 



Ansc-Agsp 6.6 22 



15 



