habitat types of the Hills vould alla^ caorparison with otr»2r isolated 

 mountain ranges (e.g. Bears Paw Mountains and Little Rocky .'-'ountains ) , 

 and identify unique tyx^es that may merit protection or special 

 management. 



Vegetation mapping 



Vegetatia-i mapping was beyond the scqpe of the rare plant inventory. 

 Mapping of general vegetaticn types identified by Thcrrpscn ard Kuijt 

 (1976) could be accctrplished using aerial ji^otographs and field 

 verificaticn. Preparation of a habitat type map would be of more value 

 to land management decisions. 



Noxious weeds 



Three state- listed noxious weeds were encountered en the PACEC during 

 the rare plant inventory: leafy spurge ( Euphorbia esula ), spotted 

 knap;';eed ( Centaurea maculosa ), and Canada thistle ( Cirsium arvense ). 

 Identified populaticns included: 



Leafy Spurge - two locations on l-fest Butte: ere in the tottcm of 

 Pratt Canyon bordering ccniferous forest (10m by 10m) and ere 

 along a mining road en the west side of West Butte (Im x 5m); 

 Spotted knapweed - A sizeable population on the edge of the quarry 

 en the east side of East Butte - isolated plants were pulled; 

 Canada thistle - A small population in a drainage north of Mount 

 Brcxsn in a moderately to heavily grazed pasture. 



Reocmmsndations for noxious weed control include: 



32 



