Utah Valley University Herbarium


Accession # 13619 
Family - UVUAPG III FamilyCronquist FamilyA Utah Flora
Species Asclepias latifolia (Torr.) Raf.
Common name   broad-leaf milkweed
G.A. Reese   4840  
Coll. Date 29 June 2010 
United States
Coconino County
Locality Tower Hill, W of Glen Canyon Dam, on undisturbed slickrock SW of the roadcut for US Highway 89, opposite Beehive Rock;
     Elev.: 4000 ft. (1220 m.)
Habitat Notes in undisturbed sandy pockets on sandstone slickrock; with Coleogyne ramosissima, Eriogonum corymbosum var. nilesii & Ephedra nevadensis; 
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 36° 56'  3" N, 111° 29'  23" W
UTM 12N 4087600N  456400E 
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.
Specimen Notes population of 13 individuals with additional, isolated individuals up to 0.25 mile SW of the collection site; population re-examined in 2011 and found not to be Asclepias welshii, the lateral veins on the leaves are not right-angled enough off the primary vein and the plant rapidly becomes less hairy & waxy with maturity; UTM coordinate precision 75 meters. 


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

     Asclepias latifolia (Torr.) Raf.

Common Name(s): broadleaf milkweed.

Taxonomic Hierarchy: (ITIS TSN=30278, click for more information and references)

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


Available images of this specimen (click to view):
specimen image: 13619b2.jpg specimen image: 13619c2.jpg specimen image: 13619d2.jpg specimen image: 13619e2.jpg
specimen image: 13619s1.jpg

Images of other samples of the same species:
specimen image: 10901s5.jpg 

Nearby Accessions

Other accessions in the database collected near this one:

Accession Name Dist., dir.
10485 Astragalus amphioxys  var. modestus   "modest crescent milkvetch" 2.3 mi. N
10518 Dalea flavescens  var. flavescens  2.3 mi. N
14849 Encelia frutescens  var. resinosa   "sticky brittlebush" 1319 ft. NE
10515 Ipomopsis pumila      "dwarf gilia" 2.3 mi. N
10521 Layia glandulosa      "white-daisy tidytips" 2.4 mi. N
10516 Malacothrix glabrata      "smooth desert-dandelion" 2.3 mi. N
10517 Phacelia integrifolia      "gypsum scorpionweed" 2.3 mi. N
10519 Senecio douglasii  var. longilobus   "thread-leaf ragwort" 2.3 mi. N
10520 Stephanomeria exigua      "small wirelettuce" 2.3 mi. N


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

Name County Dist., dir. Elevation (ft.) 7.5' Quad Name
Beehive Rock (Pillar) Coconino County, AZ 723 ft. NE 4082  Page 
Glen Canyon Substation (Locale) Coconino County, AZ 1491 ft. SE 3888  Page 
Glen Canyon Dam Visitor Center (Building) Coconino County, AZ 1505 ft. E 3419  Page 
Lake Powell (Reservoir) Coconino County, AZ 1797 ft. E 3163  Page 
Glen Canyon Dam (Dam) Coconino County, AZ 1984 ft. NE 3629  Page 
Arizona State Inspection Station (Locale) Coconino County, AZ 1.2 mi. N 4036  Page 
Sentinel Rock (Pillar) Coconino County, AZ 1.5 mi. N 3704  Page 
Wahweap Lodge and Marina (Locale) Coconino County, AZ 1.5 mi. N 3704  Page 
Page Maintenance Yard (Locale) Coconino County, AZ 1.5 mi. N 4042  Ferry Swale 
Page (Populated Place) Coconino County, AZ 2 mi. SE 4193  Page 
Emergency Medical Heliport (Airport) Coconino County, AZ 1.8 mi. SE 4295  Page 
Page Substation (Locale) Coconino County, AZ 2.2 mi. S 4147  Page 
Page Elementary School (School) Coconino County, AZ 2.3 mi. SE 4364  Page 
Page High School (School) Coconino County, AZ 2.3 mi. SE 4360  Page 
John C Page Park (Park) Coconino County, AZ 2.3 mi. SE 4357  Page 
KPGE-AM (Page) (Tower) Coconino County, AZ 2.5 mi. SE 4275  Page 
KXAZ-FM (Page) (Tower) Coconino County, AZ 2.5 mi. SE 4275  Page 
Manson Mesa (Summit) Coconino County, AZ 2.5 mi. SE 4370  Page 
Page Municipal Airport (Airport) Coconino County, AZ 2.3 mi. E 4262  Page 
Jack Doland Field (Park) Coconino County, AZ 2.7 mi. SE 4383  Page 


Taxon Links for species Asclepias latifolia  (Torr.) Raf.

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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