February 6, 1996 



MONTANA NATURAL HERITAGE PROGRAM 

 Element Occurrence Record 



Scientific Name: ASTPJVGALUS SCAPHOIDES 

 Common Name: BITTERROOT MILKVETCH 



Global rank: 03 Forest Service status: PROPOSED SENSITIVE 

 State rank: SI Federal Status: 3C 



Element occurrence code: PDFAB0F7V0 . 017 

 Element occurrence type: 



Survey site name 



EO rank 



EO rank comments 



HENNEBERRY RIDGE 



A 



LARGE POPULATION SPANNING MOST OF POTENTIAL 



POSITIONS IN LOCAL WATERSHED. 



County: BEAVERHEAD 



USGS quadrangle: ELI SPRING 



TRS comments: 



1 NW4 

 S2; 36 N2; 25 82 



Elevation: 5600 - 6400 

 Slope/aspect: 0-20% / EAST, NE 

 Size (acres) : 80 



Location: 



CA. 7.5 MILES NORTH OF CLARK CANYON RESERVOIR, IMMEDIATELY NORTH OF 

 HENNEBERRY RIDGE, WITH EXTENSIONS DOWN MAJOR GRASSHOPPER CREEK 

 TRIBUTARIES. 



Element occurrence data: 



OVER 10,000 PLANTS, APPROACHING PEAK FLOWERING 16 JUNE 1995. 

 POPULATION IS CENTERED ON UPPER BENCHLANDS, WITH DISCONTINUOUS 

 STRINGERS DOWN MAJOR TRIBUTARIES OF GRASSHOPPER CREEK AND WITH 

 FLOODPLAIN POPULATION SEGMENTS. 



General site description: 



GENTLE SEGMENTS OF ROLLING AND CHOPPY SAGEBRUSH FOOTHILLS DRAINING 

 NORTHEAST FROM HENNEBERRY RIDGE INCLUDING BENCHLANDS WITH DIABASE 

 BEDROCK, AND TRIBUTARIES OF GRASSHOPPER CREEK WITH ALLUVIAL SUBSTRATE. 

 DOMINATED BY ARTEMISIA TRIDENTATA AND AGROPYRON SPICATUM. ASSOCIATED 

 WITH PHLOX LONGIFOLIA AND ALLIUM TEXTILE. HABITAT IS IN GOOD TO 

 EXCELLENT CONDITION WHERE SAGEBRUSH STATURE IF SHORT; FAIR CONDITION 

 WHERE SAGEBRUSH IS TALL. NOT PRESENT WHERE SAGEBRUSH LOSES BUSHY 

 GROWTH FORM. 



Land ovmer/manager : 



BLM: BUTTE DISTRICT, DILLON RESOURCE AREA 

 STATE LAND - UNDESIGNATED 



Comments : 



DISTURBANCE BY LIGHT GRAZING. 



Information source: HEIDEL, BONNIE. [BOTANIST] MONTANA NATURAL 



HERITAGE PROGRAM, 1515 EAST SIXTH AVENUE, P.O. BOX 

 201800, HELENA, MT 59620-1800. WORK: 4 06/444-3 009. 



Specimens: 



