Utah Valley University Herbarium


Accession # 10927 
Family - UVUAPG III FamilyCronquist FamilyA Utah Flora
Species Asclepias ruthiae Maguire
Common name   Ruth's milkweed
J.G. Harris   3806  
Coll. Date 21 May 2005 
United States
Emery County
Locality San Rafael Swell, The Red Ledges, ca 5.5 km SW of Buckhorn Well.
     Elev.: 5445 ft. (1660 m.)
Habitat Notes clays, sands of the Carmel Formation, Ephedra community. 
Climate NCDC temperatures, daily high (red), daily average (green) and daily low (blue), from 1970 to 2000 at this location.   NCDC average monthly precipitation from 1970 to 2000 at this location.
Latitude Longitude 39° 8'  31" N, 110° 50'  12" W
Datum WGS84 
Uncertainty Polygon diameter (with coordinate as origin): GPS
Georef. Notes This coordinate was obtained by a GPS unit and an error estimate was not recorded by the user. However due to the accuracy of most units, a polygon diameter between 25 and 250 meters could reasonably be assumed.


Synonyms recognized by ITIS (bold taxon is currently accepted):

     Asclepias uncialis ssp. ruthiae (Maguire) Kartesz & Gandhi

     Asclepias eastwoodiana Barneby
     Asclepias ruthiae Maguire
     Asclepias sanjuanensis Heil, J.M. Porter & Welsh
     Asclepias uncialis var. ruthiae (Maguire) E. Sundell

Common Name(s): Ruth's milkweed.

Taxonomic Hierarchy: (ITIS TSN=524889, click for more information and references)

        Kingdom: Plantae
            Subkingdom: Tracheobionta
                Division: Magnoliophyta
                    Class: Magnoliopsida
                        Subclass: Asteridae
                            Order: Gentianales
                                Family: Asclepiadaceae
                                    Genus: Asclepias
                                        Species: Asclepias uncialis
                                            Subspecies: Asclepias uncialis ssp. ruthiae


Available images of this specimen (click to view):
specimen image: 10927f1.jpg specimen image: 10927s2.jpg

Images of other samples of the same species:
specimen image: 01066s2.jpg 
specimen image: 03955s2.jpg 
specimen image: 06548s2.jpg 
specimen image: 09598s2.jpg 
specimen image: 10910s1.jpg 
specimen image: 12094b1.jpg 
specimen image: 12094a1.jpg 
specimen image: 12094s2.jpg 
specimen image: 12094c1.jpg 
specimen image: 12117a1.jpg 
specimen image: 12117s1.jpg 

Nearby Accessions

Other accessions in the database collected near this one:

Accession Name Dist., dir.
10929 Astragalus amphioxys  var. amphioxys   "crescent milkvetch" same section
10930 Astragalus lonchocarpus      "greater rushy milkvetch" same section
10928 Camissonia eastwoodiae      "Eastwood's suncup" same section
10933 Enceliopsis nudicaulis      "nakedstem sunray" same section
10934 Ephedra torreyana      "Torrey's ephedra" same section
10931 Hilaria jamesii      "James' galleta" same section
10932 Sphaeralcea coccinea      "scarlet globemallow" same section


Nearby locations from the USGS Geographic Name Information System (GNIS) database:

Name County Dist., dir. Elevation (ft.) 7.5' Quad Name
The Red Ledges (Cliff) Emery County, UT 537 ft. N 5496  Buckhorn Reservoir 
Sand Bench (Bench) Emery County, UT 0.8 mi. N 5686  Buckhorn Reservoir 
Jorgensen Pond (Lake) Emery County, UT 1.3 mi. NW 5571  Buckhorn Reservoir 
Favorite Hills (Summit) Emery County, UT 1.6 mi. N 5683  Buckhorn Reservoir 
Fuller Bottom Draw (Valley) Emery County, UT 2 mi. SW   Buckhorn Reservoir 
Fuller Bottom (Flat) Emery County, UT 2.1 mi. SW 5259  Sids Mountain 
Chalk Hills (Summit) Emery County, UT 2.3 mi. E 5758  Buckhorn Reservoir 
Cat Canyon (Valley) Emery County, UT 2.4 mi. SW   Hadden Holes 
Cat Pond (Lake) Emery County, UT 2.8 mi. NW 5591  Buckhorn Reservoir 
Sand Pond (Lake) Emery County, UT 2.6 mi. NE 5571  Buckhorn Reservoir 
Red Wash (Valley) Emery County, UT 2.6 mi. SW   Horn Silver Gulch 
White Rocks (Pillar) Emery County, UT 3.3 mi. N 5686  Buckhorn Reservoir 
Red Knoll (Summit) Emery County, UT 2.9 mi. NE 5804  Buckhorn Reservoir 
Red Seep Wash (Valley) Emery County, UT 2.8 mi. W   Buckhorn Reservoir 
Blue Pond (Lake) Emery County, UT 3.5 mi. N 5624  Buckhorn Reservoir 
Little Wedge Plateau (Plain) Emery County, UT 3.7 mi. S 5568  Sids Mountain 
Hambrick Bottom (Bend) Emery County, UT 2.9 mi. W 5315  Hadden Holes 
Guymon Pond (Lake) Emery County, UT 3.8 mi. N 5712  Buckhorn Reservoir 
Buckhorn Well (Well) Emery County, UT 3.3 mi. NE 5620  Buckhorn Reservoir 
North Salt Wash (Valley) Emery County, UT 4 mi. S   Short Canyon 


Taxon Links for species Asclepias ruthiae  Maguire

CalPhotos, Berkeley Digital Library Project

CNPS Manual of California Vegetation Database

USDA Plants database
University of Washington Herbarium: Plants of Washington (images)

Texas A&M University: Image Library (images)

Lady Bird Johnson's Wildflower Center

Google Images

External link to this species in the UVU Herbarium:

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