Taxon Report

Arabis rigidissima Rollins var. demota Rollins

Galena Creek rockcress

Print Report

Taxon Summary

Arabis rigidissima var. demota, commonly known as Galena Creek rockcress, is a perennial herb in the Brassicaceae that is found in California and elsewhere. It occurs within Broadleafed upland forest, and Upper montane coniferous forest, growing at elevations from 2255 to 2560 meters. Arabis rigidissima var. demota is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Arabis rigidissima Rollins var. demota Rollins
Common Name:	Galena Creek rockcress
Family:	Brassicaceae
Element Code:	PDBRA061R1
USDA Plants Symbol:	ARRID
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	2255-2560 (7400-8400)
General Habitats:	Broadleafed upland forest, Upper montane coniferous forest
Microhabitat:	Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G3T3Q
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	7
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	0
Fair (C)	5
Poor (D)	0
None (X)	0
Unknown (U)	1

Location


California Endemic: False
California Counties and Islands: Name (Code)
El Dorado (ELD), Placer (PLA)
Quads: Name (Quad Code)
Martis Peak (3912031), South Lake Tahoe (3811988), Tahoe City (3912022)

Threat List Data from the CNDDB


Threat List Total:	7
EOs with Threat Listed:	Total EOs	% of EOs
	6	86 %
Foot traffic/trampling	2	28%
Logging	2	28%
ORV activity	2	28%
Recreational use (non-ORV)	2	28%
Wood cutting or brush clearing	2	28%
Development	1	14%
Road/trail construction/maint.	1	14%

Notes



Threatened by logging and fuel reduction projects. On watch list in NV. Not in TJM (1993) and TJM 2. See Journal of the Arnold Arboretum 64:498 (1983) for original description, and Novon 13(4):381-391 (2003) for revised nomenclature.
Threats:
Threatened by logging and fuel reduction projects.
Taxonomy:
Not in TJM (1993) and TJM 2.

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 12 May 2025].