CPC Plant Profile: Caper-fruit Tropidocarpum
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Plant Profile

Caper-fruit Tropidocarpum (Tropidocarpum capparideum)

  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Brassicaceae
  • State: CA
  • Nature Serve ID: 144396
  • Date Inducted in National Collection: 09/01/2001

Tropidocarpum capparideum is an annual herb with a single stem, branched from the middle or above, usually 2-5 dm long. Leaves are deeply divided into needle-like leaflets. The small flowers are yellow, sometimes with a purplish tinge, and are borne in a loose terminal cluster. Blooms March-April. [NatureServe]

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

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 2 accessions of Tropidocarpum capparideum in orthodox seed collection. There are as many as 1294 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 1 seed accessions of Tropidocarpum capparideum from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 5 maternal plants

Nature Serve Biotics
  • 05/02/2017

Known only from the vicinity of Mount Diablo in California. This species was missing from 1957 until 2003 when it was rediscovered.

  • 01/01/2010

Exotic plants.

  • 01/01/2010

Extinct in California...but Wilken reports on population in 2001 proposal!


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Taxon Tropidocarpum capparideum
Authority Greene
Family Brassicaceae
CPC Number 4352
ITIS 23432
Common Names Caper-fruited Tropidocarpum | caperfruit tropidocarpum
Associated Scientific Names Tropidocarpum capparideum
Distribution Tropidocarpum capparideum was thought to be extinct but was rediscovered in 2000.  There are 18 known occurrences within San Luis Obispo and Monterey Counties. [CNPS]
State Rank
State State Rank
California S1

Tropidocarpum capparideum prefers alkaline soils of grasslands of low hills and valleys at less than 200 m elevation. [NatureServe]

Ecological Relationships

Common Name Name in Text Association Type Source InteractionID

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