Utah Valley University Herbarium


Accession # 09569 
Family - UVUAPG III FamilyCronquist FamilyA Utah Flora
Species Asclepias asperula (Decne.) Woodson
Common name   spider milkweed
D.M. Barnes   3865  
   with K.T. Harper
Coll. Date 18 May 2004 
United States
Box Elder County
Locality [Promontory Mountains], W along Highway 83 from Brigham City, Big Fill Trailhead, picnic area N of road.
     Elev.: 4772 ft. (1455 m.)
Habitat Notes Overgrazed hill, in shallow soils of rocky knolls. 
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 41° 38'  15" N, 112° 29'  27" W
Datum Not recorded
Uncertainty Not calculated


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

     Asclepias asperula (Dcne.) Woods.

Common Name(s): antelope horns, antelopehorn milkweed, spider antelope-horns, spider milkweed.

Taxonomic Hierarchy: (ITIS TSN=30247, click for more information and references)

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


Available images of this specimen (click to view):
specimen image: 09569s2.jpg

Images of other samples of the same species:
specimen image: 01582s2.jpg 
specimen image: 02804s2.jpg 
specimen image: 03123s2.jpg 
specimen image: 03217s2.jpg 
specimen image: 03903s2.jpg 
specimen image: 05838s2.jpg 
specimen image: 07021s2.jpg 
specimen image: 08505s2.jpg 
specimen image: 11924c1.jpg 
specimen image: 11924s3.jpg 
specimen image: 11924d1.jpg 

Nearby Accessions

Other accessions in the database collected near this one:

Accession Name Dist., dir.
09537 Agoseris glauca  var. dasycephala   "short mountain dandelion" same section
09539 Astragalus beckwithii  var. beckwithii   "Beckwith's milkvetch" same section
09535 Bromus briziformis      "rattlesnake brome" same section
13228 Cirsium subniveum      "snowy thistle" same section
09564 Cirsium subniveum      "snowy thistle" same section
09562 Crepis occidentalis  var. costata   "western hawksbeard" same section
09568 Cryptantha humilis      "round-spiked cat's eye" same section
09566 Cymopterus longipes      "long-stalked spring parsley" same section
09536 Erigeron pumilus  var. concinnus   "western shaggy fleabane" same section
14680 Heterotheca villosa  var. minor   "hairy goldenaster" same section
09565 Lappula occidentalis  var. cupulata   "western stickseed" same section
14652 Linanthus watsonii      "Watson's prickly phlox" same section
09538 Linanthus watsonii      "Watson's prickly phlox" same section
09567 Lomatium grayi  var. grayi   "Gray's biscuitroot" same section
09563 Phlox longifolia      "long-leaf phlox" same section


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

Name County Dist., dir. Elevation (ft.) 7.5' Quad Name
Chinese Arch (Arch) Box Elder County, UT 0.7 mi. S 4807  Lampo Junction 
Surbon (Locale) Box Elder County, UT 0.9 mi. N 4977  Lampo Junction 
Engineer Spring (Spring) Box Elder County, UT 2.1 mi. N 4741  Lampo Junction 
Blue Creek (Stream) Box Elder County, UT 2.3 mi. SE   Ridgedale Pass 
Engineer Mountain (Summit) Box Elder County, UT 3.3 mi. N 5378  Lampo Junction 
The Church of Jesus Christ of Latter Day Saints (Church) Box Elder County, UT 2.8 mi. SW 4964  Golden Spike Monument 
Golden Spike National Historic Site (Park) Box Elder County, UT 3.1 mi. W 4905  Golden Spike Monument 
Promontory (historical) (Populated Place) Box Elder County, UT 3.2 mi. W 4915  Golden Spike Monument 
Promontory Summit (Gap) Box Elder County, UT 3.2 mi. W 4915  Golden Spike Monument 
Golden Spike Monument (Park) Box Elder County, UT 3.4 mi. W 4912  Golden Spike Monument 
Lampo Junction (Populated Place) Box Elder County, UT 3.5 mi. E 4328  Lampo Junction 
Blue Creek Valley (Valley) Box Elder County, UT 4.9 mi. NE   Ridgedale Pass 
Sand Hollow (Valley) Box Elder County, UT 5.5 mi. N   Sunset Pass 
Thiokol Airport (Airport) Box Elder County, UT 5.7 mi. N 4465  Lampo Junction 


Taxon Links for species Asclepias asperula  (Decne.) Woodson

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:

Zooming out might reveal more collections in other states.

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