Utah Valley University Herbarium


Accession # 03840 
Family - UVUAPG III FamilyCronquist FamilyA Utah Flora
Species Ambrosia psilostachya DC.
Common name   western ragweed
R. Van Buren   s.n.  
   with K. T. Harper, J. G. Cooper
Coll. Date 08 August 1999 
United States
Utah County
Locality mouth of American Fork Canyon, on Hayes private property.
Habitat Notes in the field. 
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 40° 29'  58" N, 111° 40'  23" W
Township Range T4S, R2E, Sec. 1-12  
Datum Not recorded
Uncertainty Not calculated
TRS Notes Latitude and longitude were derived from township and range information and may be
inaccurate by as much as 0.7 miles (or 4.2 miles if the section is not given).


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

     Ambrosia psilostachya DC.

     Ambrosia californica Rydb.
     Ambrosia coronopifolia Torr. & Gray
     Ambrosia cumanensis auct. non Kunth
     Ambrosia psilostachya var. californica (Rydb.) Blake
     Ambrosia psilostachya var. coronopifolia (Torr. & Gray) Farw.
     Ambrosia psilostachya var. lindheimeriana (Scheele) Blank.
     Ambrosia rugelii Rydb.

Common Name(s): Cuman ragweed, perennial ragweed, western ragweed.

Taxonomic Hierarchy: (ITIS TSN=36516, click for more information and references)

        Kingdom: Plantae
            Subkingdom: Tracheobionta
                Division: Magnoliophyta
                    Class: Magnoliopsida
                        Subclass: Asteridae
                            Order: Asterales
                                Family: Asteraceae
                                    Genus: Ambrosia
                                        Species: Ambrosia psilostachya


Available images of this specimen (click to view):
specimen image: 03840s3.jpg

Images of other samples of the same species:
specimen image: 02502s3.jpg 
specimen image: 09196s3.jpg 
specimen image: 10889s3.jpg 

Nearby Accessions

Other accessions in the database collected near this one:

Accession Name Dist., dir.
04566 Actaea rubra      "red baneberry" 1.4 mi. SW
04396 Agastache urticifolia      "nettle-leaf horse-mint" 1 mi. N
04562 Agrostis stolonifera      "creeping bentgrass" 1.4 mi. SW
04385 Artemisia michauxiana      "Michaux's wormwood" 1 mi. N
04384 Artemisia michauxiana      "Michaux's wormwood" 1 mi. N
14929 Balsamorhiza macrophylla      "cut-leaf balsamroot" 1.2 mi. W
04568 Carex haydeniana      "cloud sedge" 1.4 mi. SW
04402 Castilleja sulphurea      "sulphur paintbrush" 1 mi. N
04389 Chlorocrambe hastata      "spearhead" 1 mi. N
03841 Chrysopsis zionensis      "Zion goldenaster" same section
04383 Corydalis caseana      "Sierra fumewort" 1 mi. N
04381 Corydalis caseana      "Sierra fumewort" 1 mi. N
04571 Cystopteris fragilis      "brittle bladder fern" 1.4 mi. SW
04387 Descurainia incisa  var. incisa  1 mi. N
04644 Descurainia sophia      "flix weed" 1.4 mi. SW
04570 Epilobium brachycarpum      "tall annual willowherb" 1.4 mi. SW
03839 Epipactis gigantea      "giant helleborine" same section
05037 Erigeron arenarioides      "sand fleabane" 1 mi. E
04342 Eschscholzia californica      "California poppy" 1 mi. W
04386 Eucephalus engelmannii      "Engelmann's aster" 1 mi. N
03836 Euphorbia dentata      "toothed spurge" same section
04394 Fritillaria atropurpurea      "leopard-lily" 1 mi. N
04564 Gaillardia aristata      "common blanketflower" 1.4 mi. SW
04399 Gayophytum decipiens      "deceptive groundsmoke" 1 mi. N
04407 Geum macrophyllum  var. perincisum   "large-leaf avens" 1 mi. N
04404 Habenaria hyperborea     1 mi. N
04405 Habenaria hyperborea     1 mi. N
04392 Hieracium scouleri      "Scouler's woolly hawkweed" 1 mi. N
04649 Juncus bufonius      "toad rush" 1.4 mi. SW
04569 Juncus ensifolius  var. brunnescens  1.4 mi. SW
04650 Juncus ensifolius  var. brunnescens  1.4 mi. SW
04391 Mimulus floribundus      "many-flowered monkeyflower" 1 mi. N
04563 Panicum capillare      "witchgrass" 1.4 mi. SW
04397 Penstemon whippleanus      "Whipple's beardtongue" 1 mi. N
04400 Polygonum douglasii  var. douglasii  1 mi. N
04395 Rumex occidentalis     1 mi. N
04565 Sambucus racemosa  var. microbotrys  1.4 mi. SW
03838 Saponaria officinalis      "bouncingbet" same section
04572 Sedum debile      "orpine stonecrop" 1.4 mi. SW
04398 Senecio multilobatus      "lobeleaf groundsel" 1 mi. N
04388 Senecio serra  var. serra   "tall ragwort" 1 mi. N
03837 Setaria viridis      "green bristle grass" same section
04567 Solidago lepida  var. salebrosa   "rough Canada goldenrod" 1.4 mi. SW
04403 Solidago multiradiata  var. scopulorum   "low goldenrod" 1 mi. N
04401 Stellaria jamesiana     1 mi. N


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

Name County Dist., dir. Elevation (ft.) 7.5' Quad Name
White Canyon (Valley) Utah County, UT 1444 ft. W   Timpanogos Cave 
Silver Lake Flat (Flat) Utah County, UT 0.9 mi. E 7504  Dromedary Peak 
Silver Lake Flat (Reservoir) Utah County, UT 1 mi. E 7481  Dromedary Peak 
Silver Lake Flat Dam (Dam) Utah County, UT 1 mi. E 7481  Dromedary Peak 
Granite Flat Campground (Locale) Utah County, UT 1.2 mi. SE 6733  Timpanogos Cave 
Silver Lake Dam (Dam) Utah County, UT 1.4 mi. N 8731  Dromedary Peak 
Silver Lake (Reservoir) Utah County, UT 1.5 mi. N 8980  Dromedary Peak 
Silver Lake Summer Home Area (Populated Place) Utah County, UT 1.2 mi. E 7405  Timpanogos Cave 
Box Elder Peak (Summit) Utah County, UT 1.4 mi. SW 11034  Timpanogos Cave 
Wide Hollow (Valley) Utah County, UT 1.7 mi. SE   Timpanogos Cave 
Deer Creek (Stream) Utah County, UT 1.8 mi. SE   Dromedary Peak 
Silver Glance Lake (Lake) Utah County, UT 2.2 mi. N 9843  Dromedary Peak 
Newton Canyon (Valley) Utah County, UT 2 mi. SE   Timpanogos Cave 
Tibble Fork Reservoir (Reservoir) Utah County, UT 1.9 mi. SE 6378  Timpanogos Cave 
Tibble Fork Dam (Dam) Utah County, UT 1.9 mi. SE 6378  Timpanogos Cave 
Tibble Fork (Stream) Utah County, UT 2 mi. SE   Timpanogos Cave 
White Baldy (Summit) Salt Lake County, UT 2.4 mi. N 11100  Dromedary Peak 
Mile Rock Campground (Locale) Utah County, UT 2.2 mi. SE 6467  Timpanogos Cave 
Silver Creek (Stream) Utah County, UT 1.8 mi. E   Dromedary Peak 
Warnick Campground (Locale) Utah County, UT 2.3 mi. SE 6345  Timpanogos Cave 


Taxon Links for species Ambrosia psilostachya  DC.

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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