POLYGONUM DOUGLASII SSP AUSTINAE * 005 

 AUSTIN'S KNOTWEED 



Global rank: G5T4 Forest Service status: SENSITIVE 

 State rank: S2 Federal Status: 



Survey site name: PIKE CREEK, BURNT GULCH 



EO rank: A 

 EO rank comments: LARGE POPULATION COMPLEX; LIMITED DISTURBANCE. 

 LARGEST KNOWN OCCURRENCE. 



County: LEWIS AND CLARK 



USGS quadrangle: HOGBACK MOUNTAIN 



Township: Range: Section: TRS comments: 

 013N OOIE 19 S2, 30 CENTER 

 36 NE4NE4 



Survey date: 1992-07-29 Elevation: 5800 -6160 

 First observation: 1992-07-29 Slope/aspect: 5-45% / S, W 

 Last observation: 1992-07-29 Size (acres) : 



Location: 



BIG BELT MOUNTAINS, PIKE CREEK AND BURNT GULCH VALLEYS EAST 

 OF REFRIGERATOR CANYON, ABOVE FS RD #138, CA. 0.75 MILE WEST 

 OF LEWIS & CLARK COUNTY LINE. 



Element occurrence data: 



1000+ PLANTS IN LATE FRUIT, WITH LEAVES BECOMING A 

 CONSPICUOUS RED COLOR IN SENESCENCE. LIMITED TO A SEGMENT OF 

 OUTCROP SLOPE AND NEVER COMMON IN THIS SETTING. 



General site description: 



SHALE BARREN COMPLEX ACROSS SEVERAL SQUARE MILES WITHIN 

 PINUS PONDEROSA/AGROPYRON SPICATUM HABITAT TYPE; RECURRENT 

 ALONG SOUTH-FACING VALLEY OUTCROPS ON UPPER SLOPES. 

 ASSOCIATED SPECIES: CAREX GEYERI, LOMATIUM DISSECTUM, 

 ERIOGONUM OVALIFOLIUM, GAYOPHYTON DECIPIENS, PENSTEMON 

 ATTENUATUS, DANTHONIA UNI FLORA, ASTER LAEVIS, PRUNUS 

 VIRGINIANA, AMELANCHIER ALNIFOLIA. ALSO PRESENT IN LOW 

 NUMBERS WITH VIGOROUS PLANTS ON UNVEGETATED NATURAL SHALE 

 DRAWS DISSECTING THE OUTCROP SLOPE. OPEN EXPOSURE, DRY 

 HABITAT, SILTY SOIL. 



Land owner /manager : 



HELENA NATIONAL FOREST, HELENA RANGER DISTRICT 



Comments: 



SYMPATRIC WITH P. DOUGLASII VAR. DOUGLASII AND A POSSIBLE 

 HYBRID. ECODATA PLOT #92BH001 TAKEN (WITH P. LESICA) IN 

 T14N, RIW, SECTION 36, NE4NE4 . ROAD CONSTRUCTION AND 

 RESULTING SLOPE DESTABILIZATION AND EXOTIC INVASION ARE THE 

 ONLY MAJOR DISTURBANCES. NO MINING ACTIVITY; NO LIVESTOCK 

 FORAGING. 

 Information source: 



HEIDEL, B. 1992. [MTNHP FIELD SURVEY TO PIKE CREEK, BURNT 

 GULCH OF 29 JULY AND 9 AUGUST.] 

 Specimens: 



HEIDEL, B. (897). 1992. MONTU. 



Element Occurrence Record 



Plant Species of Special Concern 



Biq Belt and Elkhorn Mountains 



