SENSITIVE 



SCIENTIFIC NAME: ASCLEPIAS STENOPHYLLA Gray 



COMMON NAME: Narrow- leaved milkweed 



FAMILY: Asclepiadaceae (Milkweed Family) 



MONTANA STATUS: Sensitive 



GLOBAL and STATE RANKS (TNC): G4G5/S1 



USFUS STATUS: None 



USFS STATUS: None 



STATUS IN OTHER STATES: Rare in WY 



GLOBAL DISTRIBUTION: Western IL to w. AR, west to e. 



MT, CO, and TX. Peripheral. 

 MONTANA COUNTIES: Carter 

 LAND OWNERSHIP: State 



PHYSIOGRAPHIC DISTRIBUTION: Northern Great Plains 

 HABITAT: Sandy soil of grasslands in the plains, ca. 



1000 m (3,300 ft.) 

 PHENOLOGY: Flowering in late June and early July 

 COMMENTS: Narrow- leaved milkweed is currently known 



from only one site in Montana. 



SCIENTIFIC NAME: ASPLENIUM TRICHOtANES L. 



COMMON NAME: Maidenhair spleenwort 



FAMILY: Polypodiaceae (Fern Family) 



MONTANA STATUS: Sensitive 



GLOBAL and STATE RANKS (TNC): G5/SH 



USFWS STATUS: None 



USFS STATUS: Watch list 



STATUS IN OTHER STATES: Possibly extirpated in ID; 



historical in SD; SI in WY 

 GLOBAL DISTRIBUTION: Interruptedly ci rcumboreal , 



extending s., in America, to OR, AZ, TX,and GA, 



apparently absent from CA, NV, and UT. Sparse. 

 MONTANA COUNTIES: Flathead, reported for Lake 

 LAND OWNERSHIP: Flathead N.F.(?), Glacier National 



Park(?), Flathead Indian Res.(?) 

 PHYSIOGRAPHIC DISTRIBUTION: Flathead Mtns.(?), 



Livingston Range(?), Mission Mtns.(?) 

 HABITAT: Rock crevices and talus slopes, usually 



where moist, at mid-elevations in the mountains 

 PHENOLOGY: Mature fronds in July. 

 COMMENTS: This species is positively known in Montana 



from only one collection (Flathead Co.), which was 



taken nearly 100 years ago. 



SCIENTIFIC NAME: ASTER PTARHICOIDES (Nees) T. & G. 



COMMON NAME: Sneezewort aster 



FAMILY: Asteraceae (Sunflower Family) 



PERTINENT SYNONYMS: Soli dago ptarmicoides (Nees) 



Boivin 



MONTANA STATUS: Sensitive 



GLOBAL and STATE RANKS (TNC): G5/S1 



USFWS STATUS: None 



USFS STATUS: None 



GLOBAL DISTRIBUTION: Northern Great Plains, Quebec 

 and NY to MO, w. to GP; locally in NC, GA, AR. 

 Peripheral . 



MONTANA COUNTIES: Richland, Wibaux 



LAND OWNERSHIP: Private? 



PHYSIOGRAPHIC DISTRIBUTION: Great Plains 



HABITAT: Open, dry prairies, often on limestone 

 bluffs or sandy sites, 615 m (2,020 ft.) 



PHENOLOGY: Flowering August -September 



COMMENTS: This species is placed in the genus Aster 

 by Dorn (1984), but is considered to be in the genus 

 Soli dago by the Great Plains Flora Association 

 (1986). The Wibaux County record is based on a 

 report by the Great Plains Flora Association (1977). 



SCIENTIFIC NAME: ASTRAGALUS ARGOPHYLLUS Nutt. var. 

 ARGOPHYLLUS 



COMMON NAME: Si Iver- leaved milkvetch 



FAMILY: Fabaceae (Pea Family) 



MONTANA STATUS: Sensitive 



GLOBAL and STATE RANKS (TNC): G5/S1 



USFWS STATUS: None 



USFS STATUS: None 



GLOBAL DISTRIBUTION: East-central ID and sw. MT south 



to nw. WY and UT. The range of the species as a 



whole is ID to e. CA, east to sw. MT and CO. 



Peripheral . 

 MONTANA COUNTIES: Beaverhead, Madison 

 LAND OWNERSHIP: Beaverhead N.F.; private 

 PHYSIOGRAPHIC DISTRIBUTION: Beaverhead Mtns., 



Centennial Mtns., Gravelly Range 

 HABITAT: Moist or wet, usually alkaline meadows or 



sagebrush grasslands in the foothills and montane 



zones, 1950-2100 m (6,A00-6,900 ft.) 

 PHENOLOGY: Flowering in June 

 COMMENTS: Most known populations of this plant in 



Montana are small. 



SCIENTIFIC NAME: ASTER FRONDOSUS (Nutt.) T. & G. 



COMMON NAME: Short- rayed aster, alkali aster 



FAMILY: Asteraceae (Sunflower Family) 



MONTANA STATUS: Sensitive 



GLOBAL and STATE RANKS (TNC): G4/S1 



USFWS STATUS: None 



USFS STATUS: None 



GLOBAL DISTRIBUTION: Eastern WA to w. MT, south to 



CA, UT, and WY. Peripheral. 

 MONTANA COUNTIES: Sanders 

 LAND OWNERSHIP: Flathead Indian Reservation 

 PHYSIOGRAPHIC DISTRIBUTION: Little Bitterroot River 



drainage 

 HABITAT: Drying, usually saline mud along the margins 



of ponds and lakes in the valley zone; ca. 910 m 



(3,000 ft.) 

 PHENOLOGY: Flowering August through October 

 COMMENTS: This species is known from only one 



location in Montana. A report for Sheridan Co. 



(Dorn 1984) is probably based on a mislabeled 



spec i men . 



SCIENTIFIC NAME: ASTRAGALUS CERAMICUS Sheld. var. 



APUS Barneby 

 COMMON NAME: Idaho painted milkvetch 

 FAMILY: Fabaceae (Pea Family) 

 MONTANA STATUS: Sensitive 

 GLOBAL and STATE RANKS (TNC): G4T3/S1 

 USFWS STATUS: 3C 

 USFS STATUS: None 



STATUS IN OTHER STATES: Monitor list in ID. 

 GLOBAL DISTRIBUTION: Southeastern ID and extreme sw. 



MT. The species as a whole occurs from ID to ND 



south to OK, AZ, and NM. Regional endemic. 

 MONTANA COUNTIES: Beaverhead 

 LAND OWNERSHIP: BLM, Butte District; private 

 PHYSIOGRAPHIC DISTRIBUTION: Centennial Valley 

 HABITAT: Open, very sandy soil in sandhills and 



adjacent Sagebrush grassland in the foothills zone, 



2010 m (6,600 ft.) 

 PHENOLOGY: Flowering in late June and July 

 COMMENTS: This plant is locally common at the one 



known Montana site. 



