MONTANA NATURAL HERITAGE PROGRAM 



Element Occurrence Record 



Allotropa virgata 



Occurrence # 028 



Survey site name: MAY CREEK RIDGE 



EO rank: BC 

 EO rank comments: SMALL POPULATION WITH WIDELY SCATTERED 

 INDIVIDUALS, SOME HUMAN DISTURBANCE. 



County: BEAVERHEAD 



USGS quadrangle: ELK CREEK 



Township: Range: Section: TRS comments: 

 002S 018W 23 NW4NE4,NE4NW4 



Survey date: 1992-08-11 Elevation: 6480 -6720 

 First observation: 1992-08-11 Slope/aspect: 0-20% /E AND 



PREDOMINANTLY S 

 Last observation: 1992-08-11 Size (acres): 35 



Location: 



BITTERROOT MOUNTAINS, RIDGE NORTH OF MAY CREEK AND WEST OF MAY CREEK 

 CAMPGROUND (CA. 18 MILES WEST OF WISDOM ON HIGHWAY 43.) FROM 

 CAMPGROUND, TAKE TRAIL ACROSS CREEK AND HEAD UP RIDGE. 



^lament occurrence data: 



IN 1992, THERE WERE 28 PLANTS (12 WITH 22 LIVE STEMS, 7 WITH 15 DEAD 

 STEMS, AND 9 WITH 33 LIVE AND 38 DEAD STEMS), 108 TOTAL STEMS (55 LIVE 

 AND 53 DEAD STEMS) ; 99% IN FRUIT, 1% IN FLOWER, 4 OF THE DEAD STEMS 

 HAD BEEN GRAZED. 



General site description: 



PONDEROSA PINE - GROUSE WHORTLEBERRY PLANT ASSOCIATION; DRY, GRAVELLY, 

 SANDY SOIL ON MIDSLOPE OF ROLLING UPLANDS; PARTIAL SHADE EXPOSURE. 

 MANY DOWNED TREES, SOME BARE GROUND, CANOPY SOMEWHAT OPEN; 

 FIRE-SCARRED AND BLACKENED TRUNKS. WITH CAREX GEYERI , ARCTOSTAPHYLOS 

 UVA-URSI, CHIMAPHILA UMBELLATA, LUPINUS SERICEUS, BERBERIS REPENS , 

 HYPOPITYS MONOTROPA, CORALLORHIZA MACULATA, ARNICA CORDIFOLIA, 

 EPILOBIUM ANGUSTIFOLIUM, PINUS ALBA, PSEUDOTSUGA MENZIESII, VACCINIUM 

 SCOPARIUM, PINUS CONTORTA. 



Land owner/manager: 



BEAVERHEAD NATIONAL FOREST, WISDOM RANGER DISTRICT 



Comments : 



MYCORHIZAL SYMBIOSIS, EVIDENCE OF GRAZING BY MAMMALIAN HERBIVORES. 



Information source: 



POOLE, J. M. 1992. [MTNHP FIELD SURVEY TO BITTERROOT AND PIONEER 

 MOUNTAINS OF AUG. 11-13, 31 AND SEPT. 2.] 



