MONTANA NATURAL HERITAGE PROGRAM 

 Element Occurrence Record 



Scientific Name: CIRSIUM SUBNIVEUM 

 Common Name: JACKSON'S HOLE THISTLE 



Global rank: G3G4 Forest Service status: SENSITIVE 

 State rank: S2 Federal Status: 



Element occurrence code: PDAST2E2S0 . 006 

 Element occurrence type: 



Survey site name: ELK LAKE 



EO rank: A 

 EO rank comments: EXCELLENT SITE WITH WELL ESTABLISHED POPULATIONS. 



County: BEAVERHEAD 



USGS quadrangle: ELK SPRINGS 



Township: Range: Section: TRS comments: 

 013S OOIE 17 SW4; 20 CENTRAL 



Elevation: 7400 



Slope/aspect: 0-40% / SOUTHWEST, WEST, 



Size (acres) : 25 | 



Location: 



CENTENNIAL VALLEY; SITE IS CA. 1 MILE NORTH OF ELK LAKE. FOLLOW ROAD 

 ON WEST SIDE OF LAKE TO RIDGETOP, PARK AND WALK WEST CA. 0.2 MILE TO 

 SMALL ROCKY RIDGE. OTHER SITES ARE UP A DRY FORK OF NARROWS CREEK. 



Element occurrence data: 



120 PLANTS IN FOUR SUBPOPULATIONS , IN FLOWER AND FRUIT. 



General site description: 



OPEN, ERODING SCREE SLOPES (TERTIARY VOLANIC ROCK), WITH RUBUS IDAEUS, 

 JUNIPERUS COMMUNIS, SPIRAEA BETULIFOLIA AND POLYPODIUM HESPERIUM. 

 SURROUNDING FOREST IS PSEUDOTSUGA MENZIESII, JUNIPERUS SCOPULORUM AND 

 POPULUS TREMULOIDES. 



Land owner/manager: 



BEAVERHEAD NATIONAL FOREST, MADISON RANGER DISTRICT 



Comments: 



PLANTS ARE MORE OFTEN AT THE TOP OF SCREE SLOPES. 



Information source: ROE, LISA SCHASSBERGER. [BOTANIST.] 556 SPENCER, 

 HELENA, MONTANA 59 601. 



Specimens 



