Utah Valley University Herbarium


Accession # 06421 
Family - UVUAPG III FamilyCronquist FamilyA Utah Flora
Species Asclepias subverticillata (A. Gray) Vail
Common name   horsetail milkweed
J.G. Harris   2915  
Coll. Date 15 June 2001 
United States
Grand County
Locality Labyrinth Canyon of the Green River, ca. 1 km below Bowknot Bend;
     Elev.: 3936 ft. (1200 m.)
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 38° 35'  56" N, 110° 2'  23" W
Datum Not recorded
Uncertainty Not calculated


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: 06421s2.jpg

Images of other samples of the same species:
specimen image: 06281s3.jpg 
specimen image: 09181s2.jpg 
specimen image: 11995d1.jpg 
specimen image: 11995s1.jpg 

Nearby Accessions

Other accessions in the database collected near this one:

Accession Name Dist., dir.
06281 Asclepias subverticillata      "horsetail milkweed" same section
06274 Conyza canadensis  var. glabrata   "Canadian horseweed" same section
06422 Mentzelia marginata      "Colorado blazingstar" same section
14006 Schoenocrambe linifolia      "flaxleaf plainsmustard" same section


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

Name County Dist., dir. Elevation (ft.) 7.5' Quad Name
Oak Bottom (Bend) Wayne County, UT 1493 ft. W 3967  Bowknot Bend 
Bowknot Bend (Bend) Emery County, UT 0.7 mi. NE 4324  Bowknot Bend 
Twomile Canyon (Valley) Emery County, UT 1.5 mi. SW   Bowknot Bend 
Barrier Creek (Stream) Wayne County, UT 1.8 mi. S   Head Spur 
Spring Point Canyon (Ridge) Grand County, UT 1.8 mi. N 4761  Bowknot Bend 
Horseshoe Canyon (Valley) Wayne County, UT 1.9 mi. S   Head Spur 
Keg Point (Ridge) Emery County, UT 2.2 mi. NW 4849  Bowknot Bend 
Hey Joe Mine (Mine) Grand County, UT 2.9 mi. N 4196  Tenmile Point 
Hey Joe Canyon (Valley) Grand County, UT 3 mi. N   Tenmile Point 
Spring Canyon (Valley) Grand County, UT 2.5 mi. NE   Dubinky Wash 
Spring Canyon (Valley) Wayne County, UT 2.5 mi. NE   Dubinky Wash 
Spring Canyon Bottom (Bend) Grand County, UT 2.6 mi. NE 3970  Mineral Canyon 
Keg Spring Canyon (Valley) Emery County, UT 3.4 mi. N   Bowknot Bend 
Deadman Point (Ridge) Grand County, UT 3 mi. E 5026  Mineral Canyon 
Cottonwood Bottom (Bend) Emery County, UT 3.5 mi. SE 3950  Mineral Canyon 
Hell Roaring Canyon (Valley) Grand County, UT 3.7 mi. SE   The Knoll 
Keg Spring Bottom (Bend) Emery County, UT 4.4 mi. N 3983  Tenmile Point 
Tenmile Canyon (Valley) Grand County, UT 4.4 mi. N   Dee Pass 
Tenmile Bottom (Bend) Grand County, UT 4.4 mi. N 3977  Tenmile Point 
Keg Spring (Spring) Emery County, UT 4.4 mi. W 4754  Bowknot Bend 


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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