Taxon Report

Sibara filifolia (Greene) Greene

Santa Cruz Island winged-rockcress

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Taxon Summary

Sibara filifolia, commonly known as Santa Cruz Island winged-rockcress, is a annual herb in the Brassicaceae that is found only in California. It occurs within Coastal scrub (rocky, and volcanic), growing at elevations from 60 to 305 meters. Sibara filifolia is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Sibara filifolia (Greene) Greene
Common Name:	Santa Cruz Island winged-rockcress
Family:	Brassicaceae
Element Code:	PDBRA2A020
USDA Plants Symbol:	SIFI
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: (Feb)Mar-Apr	(Feb)Mar-Apr
Elevation:	60-305 (195-1000)
General Habitats:	Coastal scrub
Microhabitat:	Openings (often)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	FE
Other Status:	SB_CalBG/RSABG; SB_SBBG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	7
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	1
Unknown (U)	5

Location


California Endemic: True
California Counties and Islands: Name (Code)
Los Angeles (LAX), Santa Barbara (SBA)
Quads: Name (Quad Code)
San Clemente Island South (3211873), Santa Catalina East (3311833), Santa Catalina North (3311844), Santa Catalina South (3311834), Santa Cruz Island B (3311986), Santa Cruz Island C (3311985)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	14 %
Foot traffic/trampling	1	14%

Notes



Rediscovered in 1986 by M. Beauchamp and A. Kelly. Last seen on SCZ Isl. In 1932. Feral herbivores removed from SCM Isl., and vegetation recovering. Threatenedy by foot traffic and non-native plants. Possibly threatened on SCT Isl. by deer browsing and insect predation. See Madroño 45(4):328 (1998) for distributional information and 50(3):181-186 (2003) for genetic diversity 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 23 February 2025].