CPC Plant Profile: San Bernardino Rockcress
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Plant Profile

San Bernardino Rockcress (Boechera peirsonii)

Photo Credit: ©2011 Thomas Stoughton
  • Global Rank: T1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Brassicaceae
  • State: CA
  • Nature Serve ID: 142408
  • Date Inducted in National Collection:

The San Bernardino rock cress is the Critically Imperiled sub-species of the Brewers rock cress and a member of the mustard family. Only three known occurrences are left where they can be found in the wild and all three are along the trail leading up to Mt. San Gregorio in the San Bernardino National Forest. They prefer sloped, coniferous forests and produce tubular, skinny, purple blooms for half the year between March and August. In addition to being endemic to San Bernardino County, all three occurrences are regularly threatened by trail use.

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  • 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 Boechera peirsonii in orthodox seed collection. There are as many as 3444 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 2 seed accessions of Boechera peirsonii from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 11 maternal plants

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Taxon Boechera peirsonii
Authority Windham & Al-Shehbaz
Family Brassicaceae
CPC Number 168
ITIS 823131
Common Names San Bernardino rock cress | Brewer's rockcress
Associated Scientific Names Boechera peirsonii | Arabis breweri var. pecuniaria | Boechera breweri
Distribution A. breweri var. pecuniaria has only three occurrences left in the wild and all three can be found on the trails in Mt. San Gregorio in San Bernardino National Forest. 
State Rank
State State Rank
California S1

- subalpine forests
- talus slopes

Ecological Relationships

Common Name Name in Text Association Type Source InteractionID
Lead Institution State Reintroduction Type Year of First Outplanting

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