CPC Plant Profile: Santa Cruz Tarplant
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Plant Profile

Santa Cruz Tarplant (Holocarpha macradenia)

Description
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: Federally Threatened
  • Family: Asteraceae
  • State: CA
  • Nature Serve ID: 147015
  • Date Inducted in National Collection: 04/11/1991

summer blooming annual

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

Based on an September 2020 extract of the California Plant Rescue Database, University of California Botanical Garden holds 1 accessions of Holocarpha macradenia 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 3 accessions of Holocarpha macradenia in orthodox seed collection. There are as many as 65461 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, University of California Botanical Garden has collected 1 seed accessions of Holocarpha macradenia from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of 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 Holocarpha macradenia from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants

  • 01/01/2010

development, historic and current habitat alteration and destruction caused by residential development, recreational development, airport expansion, and agriculture

  • 01/01/2010

Currently known from a total of 18 populations; 12 of these are remaining native populations, and 6 are a result of experimental seedings. Six of the native populations occur around the city of Santa Cruz. The remaining six native populations occur around the city of Watsonville. The other six extant populations are a result of experimental seed transplants in Wildcat Regional Park in the east San Francisco Bay area

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Photos
Nomenclature
Taxon Holocarpha macradenia
Authority (DC.) Greene
Family Asteraceae
CPC Number 2269
ITIS 37739
USDA HOMA
Common Names Santa Cruz tarplant | Santa Cruz Tarweed
Associated Scientific Names Holocarpha macradenia
Distribution NA
State Rank
State State Rank
California S1
Habitat

flat coastal grasslands

Ecological Relationships

Pollinators
Common Name Name in Text Association Type Source InteractionID
Reintroduction
Lead Institution State Reintroduction Type Year of First Outplanting
University of California, Santa Cruz California Reintroduction 1999
University of California, Santa Cruz California Reintroduction 1999
University of California, Santa Cruz California Reintroduction 1999

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