47 



Baniiack (Vanderhorst 1995) for a total of eight records (Figure 19. Seven of them are wholly or partly 

 on BLM lands. Note: Specimens of Z.. cons have been reviewed and annotated at both MONT and 

 MONTU. 



3. Grasshopper Study Area distribution: The species was documented to a greater extent around 



Bamiack, and eastward toward Dillon in the Grasshopper Creek Study Area, representing four of 

 the eight known occurrences in the state (Figure 19). 



HABITAT: In Montana, Lomatium attenuatwn grows in talus and gravelly to rocky soils derived from 

 Madison Group limestone, an outcrop substrate associated with a range of landform that supports 

 distinctly calciphilic vegetation. Evert (1983) describes the soils where the species is found in Wyoming 

 as "lithosols derived from volcanic material or limestone." The species has not been found associated 

 with \'olcanics in Montana. It spans an ele\'ation of 6200-8500 feet in the state, but occurs at the lower 

 end of this range in the Grasshopper Study Area. 



In the Study Area, Lomatium attenuatwn grows in semi-arid grassland (Appendix D-15), mountain 

 mahogany (Cercocarpus ledifolius) communities and limber pine {Pinusflexilis) parkland. It occupies 

 the following habitat types: 



Agropyron spicatum h.t. 

 Cercocarpus ledifolius h.t. 

 Pinus flexilis h.t. 



A representative list of associated species includes: 



Agropyron spicatum 

 Allium textile 

 Artemisia frigida 

 Cercocarpus ledifolius 

 Cryptantha celosioides 

 Delphinium bicolor ssp. novum 

 Lesquerella pulchella 

 Petrophyton cespitosum 

 Phacelia incana 

 Pinus flexilis 

 Sphaeromeria argentea 

 Townsendia spathulata 



The vegetation is typically sparse and stress-resistant, and Lomatium attenuatum is not found in dense 

 vegetation. It is sometimes found in disturbance settings. An example is its occurrence at edges of the 

 street in Bannack; however, it here occurs in very low numbers (accidental introduction) in comparison 

 to its natural habitat. 



