MONTANA NATURAL HERITAGE PROGRAM 

 Element Occurrence Record 



mtific Name: ASCLEPIAS STENOPHYLLA 

 non Name: NARROWLEAF MILKWEED 



Dal rank: G4G5 

 ;e rank: SI 



Forest Service status : 

 Federal Status: 



nent occurrence code: PDASC021U0 . 003 

 nent occurrence type : 



/ey site name: CHALK BUTTES 



EO rank: D 

 rank comments: VERY SMALL POPULATION OR OUTLYING SEGMENT OF 

 POPULATION. 



Ity : CARTER 

 3 quadrangle: 



CHALK BUTTES 



iship: Range: Section: TRS comments: 



3 057E 21 NE4SW4, NE4SE4; 22 SW4SW4 



Precision 



Survey date 



it observation 



it observation 



1994-07-11 Elevation: 3900 - 4065 

 1994-07-11 Slope/aspect: 0-10% / E-SE 

 1994-07-11 Size (acres) : 1 



ation: 

 FROM EKALAKA, GO CA. 15 MILES SSW TO FOREST SERVICE ROAD, THEN CA. 2 

 MILES WEST TO TRENK PASS. LOCATED TO NORTH ALONG BUTTE CRESTS. 



nent occurrence data: 

 THREE WIDELY SCATTERED PLANTS ON SEPARATE BUTTE TOPS, POSSIBLY 

 REPRESENTING WAIFS FROM AN UNKNOWN LOWER POPULATION ON SURROUNDING 

 SANDY PLAIN. IN EARLY FRUIT. 



eral site description: 

 SCATTERED BUTTE TOPS ALONG CHALK BUTTES RIDGE SYSTEM WITH SANDY OR 

 GRAVELLY LOAMS . THE COMMUNITY TYPES WHERE THE THREE SEPARATE PLANTS 

 ARE FOUND INCLUDE ANDROPOGON SCOPARIUS C.T., CALAMOVILFA LONGIFOLIA 

 C.T., AND STIPA COMATA C.T. ASSOCIATED SPECIES INCLUDE AGROPYRON 

 SMITHII, CAREX FILIFOLIA, AND STIPA VIRIDULA, IN OPENINGS AMONG PINUS 

 PONDEROSA. 



d owner/manager : 

 CUSTER NATIONAL FOREST, SIOUX RANGER DISTRICT 



ments : 



ormation source: 



HEIDEL, B. AND K. DUEHOLM . 1994. SITE SURVEY OF 

 CUSTER NATIONAL FOREST, SIOUX DISTRICT, IN CARTER 

 CO., MONTANA AND HARDING CO., SOUTH DAKOTA. 



cimens : 



