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Hemizonia pungens (Hook. & Arn.) Torr. & Gray
common tarweed
Symbol: HEPU5
Group: Dicot
Family: Asteraceae
Growth Habit: Forb/herb
Duration: Annual
U.S. Nativity: Native

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More Information
About common tarweed

Link to plant Classification report for Hemizonia pungens

Plant source and reference for Hemizonia pungens

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State Distributional Map for HEPU5
© Image generated using gd 1.8
Plant Distribution by State

Hemizonia pungens (Hook. & Arn.) Torr. & Gray

HEPU5

See county distributions for the following states by clicking on them below or on the map.

CA
Arizona
California
Idaho
Nevada
New York
Oregon
Washington

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California distribution information
Related Taxa:
Hemizonia pungens (Hook. & Arn.) Torr. & Gray

View 440 genera in Asteraceae, 19 species in Hemizonia or click below on a thumbnail map or name for subspecies profiles.

Distribution of Hemizonia pungens ssp. laevis. Native. Distribution of Hemizonia pungens ssp. maritima. Native. Distribution of Hemizonia pungens ssp. pungens. Native. Distribution of Hemizonia pungens ssp. septentrionalis. Native.  
Hemizonia pungens ssp. laevis
common tarweed		 Hemizonia pungens ssp. maritima
common tarweed		 Hemizonia pungens ssp. pungens
common tarweed		 Hemizonia pungens ssp. septentrionalis
common tarweed		  
Nativity color legend

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Classification:
Hemizonia pungens (Hook. & Arn.) Torr. & Gray

Click on a scientific name below to expand it in the PLANTS Classification Report.
   
    Kingdom Plantae – Plants
       Subkingdom Tracheobionta – Vascular plants
          Superdivision Spermatophyta – Seed plants
             Division Magnoliophyta – Flowering plants
                Class Magnoliopsida – Dicotyledons
                   Subclass Asteridae –
                      Order Asterales –
                         Family Asteraceae – Aster family
                            Genus Hemizonia DC. – tarweed
                               Species Hemizonia pungens (Hook. & Arn.) Torr. & Gray – common tarweed

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Noxious Weed Information:
Hemizonia pungens (Hook. & Arn.) Torr. & Gray
This plant is listed by the U. S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location.
Oregon:
        spikeweed     "B" designated weed
        spikeweed     Quarantine
Washington:
        spikeweed     Class C noxious weed

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Invasive Information:
Hemizonia pungens (Hook. & Arn.) Torr. & Gray
        spikeweed
This plant is considered invasive by the authoritative sources noted below. This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each invasive plant list, or click here for a composite list of Invasive Plants of the U.S.
STATE   Assorted authors. 200_. State Noxious Weed Lists for 45 States. State agriculture or natural resource departments.
 
WSWS   Whitson, T.D. (Ed.) et al.. 1996. Weeds of the West. Western Society of Weed Science in cooperation with Cooperative Extension Services, University of Wyoming. Laramie, Wyoming.. 630pp.
 

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Wetland Indicator Status:
Hemizonia pungens (Hook. & Arn.) Torr. & Gray
Nat. Ind. Reg. 1 Reg. 2 Reg. 3 Reg. 4 Reg. 5 Reg. 6 Reg. 7 Reg. 8 Reg. 9 Reg. 0 Reg. A Reg. C Reg. H
UPL,FACW+ NI NO NO NO NO NO FACW+ FAC UPL FAC NO NO NO

Wetland Data InformationInterpreting wetland indicator status

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Other Species Accounts and Images:
Hemizonia pungens (Hook. & Arn.) Torr. & Gray
View photographs from CalPhotos.
View species account from ARS Germplasm Resources Information Network (GRIN).
View taxonomic account from Integrated Taxonomic Information System (ITIS) for ITIS Taxonomic Serial Number 502946.

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Related Web Sites:
Hemizonia pungens (Hook. & Arn.) Torr. & Gray

    The Nature Conservancy: Wildland Weeds Management & Research Program
    UC Davis, IPM: abstract & images
    WA-Noxious Weed List & Information

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