March 12, 1996 



MONTANA NATURAL HERITAGE PROGRAM 

 Element Occurrence Record 



Scientific Name: ASTRAGALUS BARRII 

 Common Name: BARR'S MILKVETCH 



Global rank: G3 Forest Service status: SENSITIVE 

 State rank: S3 Federal Status: 3C 



Element occurrence code: PDFAB0F150 . 037 ID: Y 

 Element occurrence type: 



Survey site name: HORSE CREEK / OTTER CREEK 



EO rank: 

 EO rank comments: 



County: POWDER RIVER 



USGS quadrangle: FORT HOWES 



Precision: S 



Survey date: Elevation: 3400 - 3800 



First observation: 1995-05-24 Slope/aspect: 0-30% / ALL 



Last observation: 1995-05-24 Size (acres) : 1 



Location: 



RIDGE NORTHWEST OF CONFLUENCE OF HORSE AND OTTER CREEKS. ONE 

 SUBPOPULATION IS ON WEST SIDE OF KNOB BETWEEN OTTER CREEK ROAD AND 

 ABANDONED ROAD (SOUTH OF OLD SCHOOL) . OTHER SUBPOPULATION IS ALONG 

 RIDGECREST CA. 0.8 AIR MILE TO THE NORTHWEST; THIS SITE IS JUST OFF 

 OTTER CREEK ROAD CA. 2.5 MILES SOUTH OF FORT HOWES WORK CENTER. 



Element occurrence data: 



SOUTHERN SUBPOPULATION HAS CA. 50 PLANTS, >90 FLOWERING, REMAINDER 

 VEGETATIVE. NORTHERN SUBPOPUL.ATION HAS 150-200 PLANTS, CA. 75% 

 FLOWERING, REMAINDER VEGETATIVE. 



General site description: 



PARTIALLY SHADED, DRY CREST AND UPPERSLOPE WITH SMALL SANDSTONE 

 OUTCROPS. SANDY-SILTY BREAKLANDS. PINUS PONDEROSA AND JUNIPERUS 

 SCOPULORUM WITH SPARSE UNDERSTORY DOMINATES SOUTHERN SUBPOPULATION. 

 ASTRAGALUS BARRII DOMINATES NORTHERN SUBPOPULATION. ASSOCIATED 

 SPECIES: COMMANDRA UMBELLATA, CAREX FILIFOLIA, ANDROPOGON SCOPARIUS. 



Land owner/manager: 



CUSTER NATIONAL FOREST, ASHLAND RANGER DISTRICT 



Comments : 



OBSERVED BY H. MARRIOTT. NATURAL EROSION ON STEEPER SLOPES HAS 

 PRODUCED PEDESTALED PLANTS. 



Information source: HEIDEL, B. L. AND H. MARRIOTT. 1996. SENSITIVE 

 PLANT SPECIES SURVEY OF THE ASHLAND DISTRICT, 

 CUSTER NATIONAL FOREST, POWDER RIVER AND ROSEBUD 

 COUNTIES, MT. UNPUBLISHED REPORT TO THE U.S. 

 FOREST SERVICE. MONTANA NATURAL HERITAGE PROGRAM. 

 PP. 



Specimens : 



