Species Details

Arabis mcdonaldiana

McDonald's rockcress

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Classification

Scientific Name: Arabis mcdonaldiana Eastw.
Common Name: McDonald's rockcress
Family:	Brassicaceae
Element Code:	PDBRA06150
USDA Plants Symbol:
Synonyms/Other Names: Arabis macdonaldiana East.

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	FE (1978-09-28)
State List:	CE (1979-07-01)
Global Rank:	G3
State Rank:	S3
Other Status:	SB_BerrySB; SB_CalBG/RSABG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2022-02-01

Ecology and Life History

Lifeform: perennial herb

Blooming Period: May-Jul

Elevation:
135 - 1800 meters
445 - 5905 feet

General Habitats:

Lower montane coniferous forest
Upper montane coniferous forest

Microhabitat Details:

Microhabitat:

Serpentine

Notes

Notes: Potentially threatened by mining. Endangered in OR, where plant needs taxonomic study. Includes A. serpentinicola. See Rhodora 43(511):350 (1941) for taxonomic treatment, and Contributions from the Gray Herbarium 204:149-154 (1973) for taxonomic information.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	13	45 %
Mining	10	34%
Road/trail construction/maint.	3	10%
Grazing	1	3%
Other	1	3%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					29
A	B	C	D	X	U
8	7	1	0	0	13

Occurrence Status:
Historical >20 Years	19
Recent <=20 Years	10

Presence:
Presumed Extant	29
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

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

California Counties and Islands: Name (Code)
Del Norte (DNT), Mendocino (MEN), Siskiyou (SIS)

Quads: Name (Quad Code)
Broken Rib Mtn. (4112386), Devils Punchbowl (4112376), Gasquet (4112378), High Divide (4112481), High Plateau Mtn. (4112388), Noble Butte (3912386), Polar Bear Mtn. (4112385), Preston Peak (4112375), Shelly Creek Ridge (4112387)

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