CPC Plant Profile: Southern Tarweed
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Plant Profile

Southern Tarweed (Centromadia parryi ssp. australis)

Description
  • Global Rank: T2 - Imperiled
  • Legal Status: N/A
  • Family: Asteraceae
  • State: CA
  • Nature Serve ID: 128984
  • Date Inducted in National Collection: 09/18/2021

Also known as the Southern Tarweed, Centromadia parryi ssp. australis is an annual herb that is primarily found in Orange and Los Angeles counties. In these areas, it can be found in freshwater wetlands and seasonally moist grasslands including the Bolsa Chica Marsh in Orange County. The small yellow, ray florets that this species produces can be seen from May through November and can grow up to 70cm tall.   

Participating Institutions
Updates
  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, Santa Barbara Botanic Garden holds 1 accessions of Centromadia parryi subsp. australis in orthodox seed collection. We are uncertain as to how many total seeds are in this collection.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, San Diego Zoo Global holds 1 accessions of Centromadia parryi subsp. australis in orthodox seed collection. We are uncertain as to how many total seeds are in this collection.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 7 accessions of Centromadia parryi subsp. australis in orthodox seed collection. There are as many as 187696 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, San Diego Zoo Global has collected 1 seed accessions of Centromadia parryi subsp. australis from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 101 maternal plants

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, Santa Barbara Botanic Garden has collected 1 seed accessions of Centromadia parryi subsp. australis from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 69 maternal plants

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 2 seed accessions of Centromadia parryi subsp. australis from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants

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Photos
Nomenclature
Taxon Centromadia parryi ssp. australis
Authority (D.D. Keck) B.G. Baldw.
Family Asteraceae
CPC Number 44937
ITIS 780715
USDA CEPAA
Common Names pappose tarweed | southern tarweed | southern tarplant
Associated Scientific Names Hemizonia parryi ssp. australis | Hemizonia australis | Centromadia parryi ssp. australis
Distribution C. p. ssp. australis is primarily grown in Orange and Los Angeles counties but can found as north as Santa Barbara and as south as San Diego. 
State Rank
State State Rank
California S2
Habitat

C. p. ssp. australis prefers wetland and grassland habitats that have seasonally moist periods and high salinity soil. This species thrives at sea level but can be seen at elevations as high as 200ft. 

Ecological Relationships

Pollinators
Common Name Name in Text Association Type Source InteractionID
Bees
Leaf-cutting bees Ashmeadiella californica californica Not Specified Link
Sweat bees Augochlorella pomoniella Not Specified Link
Long-horned bees Xenoglossodes pomonae Not Specified Link
Bumble bees Bombus occidentalis nigroscutatus Not Specified Link
Sweat bees Dialictus incompletus Not Specified Link
Cuckoo bees Epeolus minimus Not Specified Link
Cuckoo bees Triepeolus californicus Not Specified Link
Butterflies & Moths
Skippers Ochlodes sylvanoides Not Specified Link
Noctuid moths Schinia Not Specified Link
Beetles
Blister beetles Epicauta puncticollis Not Specified Link
Flies
Bee flies Villa sinuosa jaennickeana Not Specified Link
Syrphid flies Eristalis hirtus Not Specified Link
Bee flies Geron grandis Not Specified Link
Bee flies Geron Not Specified Link
Bee flies Geron subauratus Not Specified Link
Bee flies Geron vitripennis Not Specified Link
Bee flies Lordotus zonus Not Specified Link
Tachinid flies Meledonus Not Specified Link
Tachinid flies Mochlosoma Not Specified Link
Bee flies Oligodranes Not Specified Link
Bee flies Poecilanthrax willistonii Not Specified Link
Syrphid flies Sphaeruphoria sulphoripes Not Specified Link
Syrphid flies Syrphus opinator Not Specified Link
Syrphid flies Toxomerus occidentalis Not Specified Link
Bee flies Villa edititoides Not Specified Link
Bee flies Villa inops Not Specified Link
Bee flies Villa lateralis ater Not Specified Link
Bee flies Villa lateralis lateralis Not Specified Link
Other
Parasitoid wasps Cardiochiles californicus Not Specified Link
Potter wasps Stenodynerus blandus Not Specified Link
Yellowjackets Vespula pennsylvanica Not Specified Link

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