South Texas Ragweed / Center For Plant Conservation
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Plant Profile

South Texas Ragweed (Ambrosia cheiranthifolia)

Photo Credit: Michael Eason
  • Global Rank: G2 - Imperiled
  • Legal Status: Federally Endangered
  • Family: Asteraceae
  • State: TX
  • Nature Serve ID: 150493
  • Lifeform: Forb/herb
  • Date Inducted in National Collection:

Where is South Texas Ragweed (Ambrosia cheiranthifolia) located in the wild?


weedy remnant areas that haven't been plowed roadsides cemetaries



States & Provinces:

South Texas Ragweed can be found in Texas

Which CPC Partners conserve South Texas Ragweed (Ambrosia cheiranthifolia)?

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

Tina Stanley
  • 08/29/2022
  • Living Collection Propagation Research

As of August 2022, San Antonio Botanical Garden holds this species in living collection and has conducted propagation research.

Nature Serve Biotics
  • 05/02/2017

Only an estimated 20 population centers survive, and since most popluations are clonal, these may represent very few genetically different individual plants. The species' geographic range is limited to coastal south Texas and northeastern Mexico. Much of its original habitat has been converted to agricultural fields and pastures. The remnant, fragmented native prairies and savannahs are threatened by continued habitat distruction, agricultural chemicals, and by invasive, non-native grasses, which are commonly planted in the area.

  • 01/01/2010

Habitat conversion done for all native habitat

  • 01/01/2010

9-10 locations (probably more than we know of) near Violet, TX (at railroad right-of-way)


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Taxon Ambrosia cheiranthifolia
Authority A. Gray
Family Asteraceae
CPC Number 101
ITIS 36502
Duration Perennial
Common Names South Texas Ragweed | Rio Grande ragweed | South Texas ambrosia
Associated Scientific Names Ambrosia cheiranthifolia
Distribution NA
State Rank
State State Rank
Texas S2
Ecological Relationships

Common Name Name in Text Association Type Source InteractionID
Wind Confirmed Pollinator Link
Insects Suspected Pollinator Floral Link

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