Species Details

Arabis mcdonaldiana

McDonald's rockcress

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Photo by © 2003 Norman Jensen  max-height:128px; max-width:145px;
© 2003 Norman Jensen
Photo by © 2009 Norman Jensen  max-height:128px; max-width:145px;
© 2009 Norman Jensen
Photo by © 2005 Dwain Goforth  max-height:128px; max-width:145px;
© 2005 Dwain Goforth
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
Lifeform: perennial herb
Blooming Period: May-Jul
Elevation:
135 - 1800 meters
445 - 5905 feet
General Habitat:
  • Lower montane coniferous forest
  • Upper montane coniferous forest
General Micro Habitat:
Micro Habitat:
  • Serpentinite
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:
Other:
Total Occurrences: 29
Element Occurrence Ranks:
A B C D X U
8 7 1 0 0 13
Occurrence Status:
Historical >20 Years 14
Recent <=20 Years 15
Presence:
Presumed Extant 29
Possibly Extirpated 0
Presumed Extirpated 0
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.

Map

Presumed Extant
Counties   Quads