Utah Valley University Herbarium


Accession # 11995 
Family - UVUAPG III FamilyCronquist FamilyA Utah Flora
Species Asclepias subverticillata (A. Gray) Vail
Common name   horsetail milkweed
Donna M. Barnes   5431  
Coll. Date 27 September 2006 
United States
Washington County
Locality along a dirt road E of Virgin, about 5 road miles from Utah Highway 9 [E of Dalton Wash, J. Alexander 2015];
     Elev.: 4456 ft. (1359 m.)
Habitat Notes sandstone cliff area, pinyon 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 37° 11'  39" N, 113° 7'  5.3" W
Datum Not recorded
Uncertainty Polygon diameter (with coordinate as origin): 1' (1800 m.)


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

     Asclepias subverticillata (Gray) Vail

     Asclepias galioides auct. non Kunth

Common Name(s): horsetail milkweed, poison milkweed, W. whorled milkweed, western whorled milkweed, whorled milkweed.

Taxonomic Hierarchy: (ITIS TSN=30308, click for more information and references)

        Kingdom: Plantae
            Subkingdom: Tracheobionta
                Division: Magnoliophyta
                    Class: Magnoliopsida
                        Subclass: Asteridae
                            Order: Gentianales
                                Family: Asclepiadaceae
                                    Genus: Asclepias
                                        Species: Asclepias subverticillata


Available images of this specimen (click to view):
specimen image: 11995s1.jpg specimen image: 11995d1.jpg

Images of other samples of the same species:
specimen image: 06281s3.jpg 
specimen image: 06421s2.jpg 
specimen image: 09181s2.jpg 

Nearby Accessions

Other accessions in the database collected near this one:

Accession Name Dist., dir.
11993 Brickellia californica      "California brickellbush" same section
11994 Chrysopsis villosa  var. minor   "hairy goldenaster" same section
11992 Datura wrightii      "sacred thorn-apple" same section


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

Name County Dist., dir. Elevation (ft.) 7.5' Quad Name
Crater Hill (Summit) Washington County, UT 1.4 mi. NE 5122  Springdale West 
Grafton Mesa (Summit) Washington County, UT 2 mi. S 3612  Springdale West 
Grafton Wash (Valley) Washington County, UT 2.1 mi. S   Smithsonian Butte 
Pastry Ridge (Ridge) Washington County, UT 2.7 mi. S 4298  Springdale West 
Scoggins Wash (Valley) Washington County, UT 2.3 mi. E   Springdale West 
Coalpits Wash (Valley) Washington County, UT 2.6 mi. SE   Springdale East 
Grafton (Populated Place) Washington County, UT 2.8 mi. SE 3665  Springdale West 
Dalton Wash (Valley) Washington County, UT 2.6 mi. W   Springdale West 
Virgin Oil Field (Oilfield) Washington County, UT 2.9 mi. NW 3862  Virgin 
South Wash (Valley) Washington County, UT 2.9 mi. SE   Smithsonian Butte 
Grafton Cemetery (Cemetery) Washington County, UT 3 mi. SE 3694  Springdale West 
Virgin Canal (Canal) Washington County, UT 3.3 mi. NW 3652  Virgin 
Cornelius Wash (Valley) Washington County, UT 3.2 mi. W   Virgin 
Petrified Forest (Area) Washington County, UT 3.2 mi. E 4354  Springdale West 
Petrified Forest (Area) Washington County, UT 3.2 mi. E 4351  Springdale West 
Mountain Dell (Basin) Washington County, UT 3.9 mi. N 3839  Virgin 
North Creek (Stream) Washington County, UT 3.3 mi. W   The Guardian Angels 
Dry Creek (Stream) Washington County, UT 4 mi. N   Smith Mesa 
Black Wash (Valley) Washington County, UT 4.1 mi. N   The Guardian Angels 
Midville Site (Locale) Washington County, UT 4.4 mi. N 3940  The Guardian Angels 


Taxon Links for species Asclepias subverticillata  (A. Gray) Vail

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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