Taxon Report

Arabis modesta Roll.

modest rockcress

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Taxon Summary

Arabis modesta, commonly known as modest 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 120 to 800 meters. Arabis modesta is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Arabis modesta Roll.
Common Name:	modest rockcress
Family:	Brassicaceae
Element Code:	PDBRA06180
USDA Plants Symbol:	ARMO
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Mar-Jul	Mar-Jul
Elevation:	120-800 (395-2625)
General Habitats:	Chaparral, Lower montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
Lake (LAK), Napa (NAP), Siskiyou (SIS), Solano (SOL), Trinity (TRI)
Quads: Name (Quad Code)
Dedrick (4012371), Forks of Salmon (4112333), Hamburg (4112371), Hayfork Bally (4012362), Helena (4012372), Horse Creek (4112278), Ironside Mtn. (4012374), Jericho Valley (3812274), Kangaroo Mtn. (4112382), Knoxville (3812273), Monticello Dam (3812251), Mt. George (3812232), Orleans Mtn. (4112334), Preston Peak (4112375), Seiad Valley (4112372), Somes Bar (4112344), Youngs Peak (4112323)

Threat List Data from the CNDDB


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

Notes



Intergrades with A. oregana in SIS Co.; may be a variety of that plant. Endangered in OR. See Rhodora 43(511):350-352 (1941) for taxonomic treatment, and Contributions from the Gray Herbarium 204:149-154 (1973) for taxonomic information.
Threats:

Taxonomy:

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 27 January 2025].