CPC Plant Profile: Santa Susana Tarweed
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Plant Profile

Santa Susana Tarweed (Deinandra minthornii)

Description
  • Global Rank: G2 - Imperiled
  • Legal Status: N/A
  • Family: Asteraceae
  • State: CA
  • Nature Serve ID: 138357
  • Date Inducted in National Collection: 03/08/1989

Hemizonia minthornii, or Santa Susana tarplant, is a perennial subshrub in the aster family that produces yellow flowers from July to November. It grows in crevices of sandstone bluffs and outcrops in the chaparral in the Santa Susana and Santa Monica mountains of Los Angeles and Ventura counties.

Participating Institutions
Updates
  • 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 Deinandra minthornii in orthodox seed collection. There are as many as 15763 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, California Botanic Garden has collected 4 seed accessions of Deinandra minthornii from 4 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 102 maternal plants

Nature Serve Biotics
  • 05/02/2017

Endemic to California, Hemizonia minthornii occurs in Los Angeles and Ventura Counties. Threats include development.

  • 01/01/2010

Threats include residential development, new roads and road maintenance.

  • 01/01/2010

There were over 20 known occurrences of Santa Susana tarplant, but one-fourth of these have not been seen in many years and their current status is unknown.

  • 01/01/2010

Remaining habitat is spread among several private landowners and the Los Angeles Department of Water and Powers, therefore little of this plant's habitat is protected.

  • 01/01/2010

A habitat conservation plan is needed and research on its reproductive biology, germination and growth and habitat requirements will be necessary in formulating a conservation strategy.

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Photos
Nomenclature
Taxon Deinandra minthornii
Authority (Jeps.) B.G. Baldwin
Family Asteraceae
CPC Number 2215
ITIS 780281
USDA DEMI4
Common Names Santa Susana tarplant | Santa Susana tarweed
Associated Scientific Names Hemizonia minthornii | Deinandra minthornii
Distribution Historically, Hemizonia minthornii was found in the Santa Susana and Santa Monica mountains of Los Angeles and Ventura counties.
State Rank
State State Rank
California S2
Habitat

Hemizonia minthornii is restricted to sandstone bluffs and outcrops in the chaparral.

Ecological Relationships

Ecological relationships are largely unknown.

Pollinators
Common Name Name in Text Association Type Source InteractionID

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