Taxon Details

Boechera peirsonii

San Bernardino rockcress

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Taxon Summary:

Boechera peirsonii, commonly known as San Bernardino rockcress, is a perennial herb in the Brassicaceae that is found only in California. It occurs within Subalpine coniferous forest, growing at elevations from 2700 to 3200 meters. Boechera peirsonii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Boechera peirsonii Windham & Al-Shehbaz
Common Name: San Bernardino rockcress
Family:	Brassicaceae
Element Code:	PDBRA06053
USDA Plants Symbol:
Synonyms/Other Names: Arabis breweri var. pecuniaria
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G1
State Rank:	S1
Other Status:	SB_CalBG/RSABG; USFS_S
CRPR Changes:
Add Date:	1980-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Mar-Aug

Elevation:
2700 - 3200 meters
8860 - 10500 feet

General Habitats:

Subalpine coniferous forest (rocky)

Microhabitat Details:

Microhabitat:

Notes

Notes: Known from only two occurrences in the San Gorgonio Wilderness Area. Potentially threatened by foot traffic. See Rhodora 43(511):409 (1941) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	2	67 %
Erosion/runoff	1	33%
Foot traffic/trampling	1	33%
Over-collecting/poaching	1	33%
Recreational use (non-ORV)	1	33%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					3
A	B	C	D	X	U
0	0	0	0	0	3

Occurrence Status:
Historical >20 Years	2
Recent <=20 Years	1

Presence:
Presumed Extant	3
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
San Bernardino (SBD)

Quads: Name (Quad Code)
San Gorgonio Mtn. (3411617)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory