Taxon Report

Corethrogyne filaginifolia (H. & A.) Nutt. var. linifolia Hall

Del Mar Mesa sand aster

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Taxon Summary

Corethrogyne filaginifolia var. linifolia, commonly known as Del Mar Mesa sand aster, is a perennial herb in the Asteraceae that is found only in California. It occurs within Chaparral (maritime, openings), Coastal bluff scrub, and Coastal scrub, growing at elevations from 5 to 150 meters. Corethrogyne filaginifolia var. linifolia is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Corethrogyne filaginifolia (H. & A.) Nutt. var. linifolia Hall
Common Name:	Del Mar Mesa sand aster
Family:	Asteraceae
Element Code:	PDAST2M027
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Sep	May-Sep
Elevation:	5-150 (15-490)
General Habitats:	Chaparral, Coastal bluff scrub, Coastal scrub
Microhabitat:	Sandy
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G4T1Q
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	SB_CRES
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	43
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	6
Fair (C)	3
Poor (D)	3
None (X)	3
Unknown (U)	26

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Diego (SDG)
Quads: Name (Quad Code)
Del Mar (3211782), Encinitas (3311713), Rancho Santa Fe (3311712), San Luis Rey (3311723)

Threat List Data from the CNDDB


Threat List Total:	6
EOs with Threat Listed:	Total EOs	% of EOs
	27	63 %
Development	21	48%
Road/trail construction/maint.	10	23%
Foot traffic/trampling	3	6%
Non-native plant impacts	3	6%
Other	1	2%
Recreational use (non-ORV)	1	2%

Notes




Threats:
Threatened by development, trampling, non-native plants, and road maintenance.
Taxonomy:
A synonym of Lessingia filaginifolia var. filaginifolia in The Jepson Manual and a synonym of Corethrogyne filaginifolia in the Jepson eFlora.

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 13 December 2025].