Scientific Name: ASCLEPIAS STENOPHYLLA 

 Common Name: NARROWLEAF MILKWEED 



Global rank: G4G5 

 State rank: SI 



Forest Service status: 

 Federal Status: 



Element occurrence code: PDASC021U0 . 005 



Element occurrence type: 



Survey site name: BOXELDER CREEK 



EG rank: C 

 EO rank comments: SMALL POPULATION; HABITAT NEARBY AFFECTED BY SHEEP 

 GRAZING. 



County: CARTER 



USGS quadrangle: MILL IRON 



Township: Range: Section: TRS comments: 

 OOIN 061E 19 NW4NE4; 18 SE4SW4 



Precision: S 



Survey date: 1997-07-02 



First observation: 1997-07-02 



Last observation: 1997-07-02 



Elevation: 3200 - 3300 

 Slope/aspect: 30%/SE 

 Size (acres) : 1 



Location: 



HILLS CA. 2.2 AIR MILES SOUTHEAST OF MILL IRON, ABOVE BOXELDER CREEK. 

 POPULATION IN SOUTHEAST-FACING SWALE CA. 0.2 AIR MILE EAST-NORTHEAST 

 OF USGS "ELDER" BENCHMARK. 



Element occurrence data: 



2 6 PLANTS; TWO SUBPOPULATIONS; 



100% IN FLOWER. 



General site description: 



DRY UPPERSLOPE IN SANDY SOIL OVER SANDSTONE PARENT. PINUS 

 PONDEROSA/CALAMOVILFA LONGIFOLIA/STIPA COMATA ECOTONE HT. ASSOCIATED 

 PLANTS INCLUDE CAREX HELIOPHYLLA, CAREX FILIFOLIA, PSORALEA ESCULENTA, 

 PSORALEA ARGOPHYLLA, TRADESCANTIA OCCIDENTALIS, ASCLEPIAS VIRIDIFLORA, 

 CIRSIUM UNDULATUM, LYGODESMIA JUNCEA, BROMUS TECTORUM, AND YUCCA 

 GLAUCA. 



Land owner /manager : 



BLM: MILES CITY DISTRICT, POWDER RIVER RESOURCE AREA 



Comments : 



OBSERVED BY J. VANDERHORST. AREA GRAZED BY SHEEP AND CATTLE SINCE 

 1880'S. 



Information source: VANDERHORST, J. [BOTANIST]. P.O. BOX 1026, TROY, 

 MT 59935. 



Specimens: VANDERHORST, J. (5687). 1997. MONT. 



