February 6, 1996 



33 



MONTANA NATURAL HERITAGE PROGRAM 

 Element Occurrence Record 



Scientific Name: ASTRAGALUS SCAPHOIDES 

 ^Common Name: BITTERROOT MILKVETCH 



Global rank: G3 

 State rank: SI 



Forest Service status: PROPOSED SENSITIVE 

 Federal Statiis: 3C 



Element occurrence code: PDFAB0F7V0 . 00 8 

 Element occurrence type: 



Survey site name 



EO rank 



EO rank comments 



CLARK CANYON SCHOOL SECTION 



B 



IvlAJOR POPULATION COMPLEX WITH MANAGEMENT CONCERNS. 



County: BEAVERHEAD 



USGS quadrangle: ELI SPRING 



Township: Range: Section: TRS comments: 



009S OllW 25 SW4SW4; 35 NE4NE4 ; 36 NW4NW4 



009S OllW 26 NW4, SW4 



Precision 



Survey date 



First observation 



Last observation 



1986-06-22 



1986 



1995-06-15 



Elevation: 5860 

 Slope/aspect: 

 Size (acres) : 70 



Location: 



CA. 2.25 AIR MILES NORTH OF CLARK CANYON RESERVOIR, ALONG DIRT ROAD 

 HEADING NORTH TO HEITOEBERRY RIDGE; 

 MILES SW OF DILLON. 



CA. 3 AIR MI. W. OF 1-15, 



18 



Element occurrence data: 



6/15/95: ADDITIONAL SUBPOPULATIONS IN SEC. 26 WITH OVER 3 00 PLANTS. 

 THE POPULATION SEGMENTS ON BLM LAND HAVE EXCELLENT VIGOR AND 

 FLOWERING. ON THE MORE HEAVILY GRAZED STATE LAND THERE IS ALMOST NO 

 FLOWERING, AND DENSITY IS LOW. 1986: CA . 1500-2000 PLANTS, EARLY TO 

 MATURE FRUIT; CATTLE TRAILS TRAVERSE A PORTION OF THE HABITAT; A FEW 

 P-^^ANTS HAD BEEN GRAZED; MANY ACRES OF POTENTIAL HABITAT IN THE AREA; 

 r-ORE SURVEY WORK NEEDED. 6/13/94: 60% VEGETATIVE, 40% EARLY FRUIT, 

 1000-10,000 ESTABLISHED PLANTS, SOME BROWSED HEADS. 6/20/94: 2 

 SUBPOPULATIONS TO NORTHWEST WITH CA. 100 PLANTS, 50% FLOWERING, 50% 

 FRUITING. 



General site description: 



GRAVELLY LOAM SOILS; ARTEMISIA TRIDENTATA/STIPA COMATA, W/ AGROPYRON 

 SPICATUM, ARTEMISIA FRIGIDA, LEPTODACTYLON PUNGENS, ORYZOPSIS 

 HYMENOIDES, PHACELIA LINEARIS, OPUNTIA. 



Land owner/manager: 



BLM: BUTTE DISTRICT, DILLON RESOURCE AREA 

 STATE LAND - UNDESIGNATED 

 Comments : 



SPOTTED KNAPWEED IS ENCROACHING IN THE CORE POPULATION ALONG THE 

 ROADWAY IN SEC. 25. OBSERVED IN 1995 BY B. HEIDEL. 

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



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

 201800, HELENA, MT 59620-1800. WORK: 406/444-3 009. 



Specimens: SHELLY, J. S. (1157) & G. V. KING. 1986. MONTU. 



VANDERHORST, J. (5200). 1994. SPECIMEN #119505 . MONT. 



