Taxon Details

Arabis aculeolata

Waldo rockcress

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Taxon Summary:

Arabis aculeolata, commonly known as Waldo rockcress, is a perennial herb in the Brassicaceae that is found in California and elsewhere. It occurs within Broadleafed upland forest, Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 410 to 1800 meters. Arabis aculeolata is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Arabis aculeolata Greene
Common Name: Waldo rockcress
Family:	Brassicaceae
Element Code:	PDBRA06010
USDA Plants Symbol:	ARAC4
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:	G4
State Rank:	S2
Other Status:	SB_BerrySB
CRPR Changes: changed from 2.2 to 2B.2 on 2012-04-11
Add Date:	1980-01-01
Date Edited:	2023-05-02

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Apr-Jun

Elevation:
410 - 1800 meters
1345 - 5905 feet

General Habitats:

Broadleafed upland forest
Lower montane coniferous forest
Upper montane coniferous forest

Microhabitat Details:

Microhabitat:

Serpentine

Notes

Notes: On watch list in OR.
Threats: Threatened by logging and mining.
Taxonomy: Not in TJM 2.

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	2
	Total EOs	% of EOs
EOs with Threat Listed:	2	25 %
Logging	2	25%
Erosion/runoff	1	12%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					8
A	B	C	D	X	U
0	0	0	0	0	8

Occurrence Status:
Historical >20 Years	7
Recent <=20 Years	1

Presence:
Presumed Extant	8
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), Siskiyou (SIS)

Quads: Name (Quad Code)
Clear Creek (4112364), Devils Punchbowl (4112376), Hamburg (4112371), High Divide (4112481), High Plateau Mtn. (4112388), Kangaroo Mtn. (4112382), 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 Status Review:	Proposed retention as CRPR 2.2 (2012)
Original Description:	Leaflets of Botanical Observation and Criticism 2:69-88 (1910)
Taxonomic Treatment:	Rhodora 43(511):352-353 (1941)
Species Account:	Arabis aculeolata profile for potential Species of Conservation Concern evaluation (2018)
Other:	Contributions from the Gray Herbarium 204:151 (1973)

CNPS Rare Plant Inventory