CIRSIUM LONGISTYLUM * 023 

 LONG-STYLED THISTLE 



Global rank; 

 State rank: 



G2Q 

 S3 



Forest Service status: 

 Federal Status: 



C2 



Survey site name: 



EO rank: 



EO rank comments: 



ATLANTA RIDGE 



A 



LARGE POPULATION IN INTACT HABITAT. 



County: MEAGHER 

 USGS quadrangle: 



Township: 

 009N 



Range: 

 004E 



BOULDER BALDY 



Section: 

 06 



TRS comments: 



S2NW4, N2SW4, 5 NW4SW4 



Survey date: 1992-07-15 



First observation: 1992-07-15 

 SOUTH 



Last observation: 1992-07-15 



Elevation: 6400 -7440 

 Slope/aspect: 0-10% / EAST, 



Size (acres) : 40 



Location: 



BIG BELT MOUNTAINS, ON ATLANTA RIDGE ABOVE ATLANTA CREEK, 

 WEST OF ATLANTA ROAD (FS RD #57 5) , UPPER END OF RIDGE, ALSO 

 ALONG ATLANTA CREEK AND DIVERSION CHANNEL IN FEWER NUMBERS. 



Element occurrence data: 



250-400 PLANTS IN PEAK FLOWERING, THE MAJORITY AT WEST END 

 IN MEADOW SETTING. WEEVILS PRESENT. 



General site description: 



MOST NUMEROUS IN TRANSITION BETWEEN FESTUCA SCABRELLA 

 HABITAT TYPE AND DESCHAMPSIA CESPITOSA-OENTHONIA PARRYI 

 ASSOCIATED WITH IRIS MISSOURIENSIS, AGROPYRON CANINUM, 

 EQUISETUM ARVENSE, GALIUM BOREALE, POTENTILLA GRACILIS, 

 OXYTROPIS SERICEA; INTO OPEN PINUS CONTORTA. ALSO ALONG 

 SPARSELY VEGETATED DIVERSION CHANNEL BANKS, AND WIDELY 

 SCATTERED ALONG ATLANTA RIDGE ABOVE MEADOW SPECIES LIKE 

 HERACLEUM LANATUM AND MERTENSIA OBLONGIFOLIA. 



HT, 



Land owner/manager: 



HELENA NATIONAL FOREST, 



TOWNSEND RANGER DISTRICT 



Comments: 



REPRESENTS LARGEST AND MOST NATURAL OCCURRENCE OF CIRSIUM 

 LONGISTYLUM ON HELENA NATIONAL FOREST. TEN SPECIMENS 

 COLLECTED BY B. HEIDEL FOR MORPHOMETRIC STUDY (NOT SUITED 

 FOR HERBARIUM) . 



Information source: 



HEIDEL, B. 1992. [MTNHP FIELD SURVEY TO ATLANTIC RIDGE OF 15 

 JULY . ] 



Specimens: 



HEIDEL, B. (820) . 1992. 



Element Occurrence Record 



Plant Species of Special Concern 



