Taxon Details

Arabis oregana

Oregon rockcress

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Taxon Summary:

Arabis oregana, commonly known as Oregon rockcress, is a perennial herb in the Brassicaceae that is found in California and elsewhere. It occurs within Chaparral, and Lower montane coniferous forest, growing at elevations from 600 to 1830 meters. Arabis oregana is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification

Scientific Name: Arabis oregana Roll.
Common Name: Oregon rockcress
Family:	Brassicaceae
Element Code:	PDBRA061A0
USDA Plants Symbol:	AROR
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	4.3
Fed List:	None
State List:	None
Global Rank:	G3G4Q
State Rank:	S3
Other Status:
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2023-05-02

Ecology and Life History

Lifeform: perennial herb

Blooming Period: May

Elevation:
600 - 1830 meters
1970 - 6005 feet

General Habitats:

Chaparral
Lower montane coniferous forest

Microhabitat Details:

Microhabitat:

Serpentine

Notes

Notes: Many collections in Klamath region.
Threats:
Taxonomy: Exact taxonomic status of NAP Co. occurrence needs to be determined.

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	0
	Total EOs	% of EOs
EOs with Threat Listed:	0	0 %

Occurrence Data from the CNDDB

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

Occurrence Status:
Historical >20 Years	0
Recent <=20 Years	0

Presence:
Presumed Extant	0
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA), Oregon (OR)

California Counties and Islands: Name (Code)
Napa (NAP), Siskiyou (SIS), Trinity (TRI)

Quads: Name (Quad Code)
Clear Creek (4112364), Dees Peak (4112313), Dewey Gulch (4112273), Forks of Salmon (4112333), Hamburg (4112371), Hayfork Bally (4012362), Indian Creek Baldy (4112267), Jericho Valley (3812274), Kangaroo Mtn. (4112382), Knoxville (3812273), McKinley Mtn. (4112277), Orleans Mtn. (4112334), Scott Bar (4112361), Seiad Valley (4112372), Somes Bar (4112344), Youngs Peak (4112323)

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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Taxonomic Treatment:	Rhodora 43(511):349-350 (1941)
Species Account:	Arabis oregana profile for potential Species of Conservation Concern evaluation (2018)
Other:	Contributions from the Gray Herbarium 204:149-154 (1973)

CNPS Rare Plant Inventory