Taxon Report

Erigeron serpentinus G. Nesom

serpentine daisy

Print Report

Taxon Summary

Erigeron serpentinus, commonly known as serpentine daisy, is a perennial herb in the Asteraceae that is found only in California. It occurs within Chaparral (seeps, and serpentinite), growing at elevations from 60 to 670 meters. Erigeron serpentinus is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Erigeron serpentinus G. Nesom
Common Name:	serpentine daisy
Family:	Asteraceae
Element Code:	PDAST3M5M0
USDA Plants Symbol:	ERSE8
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Aug	May-Aug
Elevation:	60-670 (195-2200)
General Habitats:	Chaparral
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG
CRPR Changes:	changed from 1B.3 to 1B.2 on 2025-02-03

Occurrence Data from the CNDDB


Total Occurrences:	6
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	1
Fair (C)	2
Poor (D)	0
None (X)	0
Unknown (U)	1

Location


California Endemic: True
California Counties and Islands: Name (Code)
Sonoma (SON)
Quads: Name (Quad Code)
Arched Rock (3812342), Cazadero (3812351), Duncans Mills (3812341), Fort Ross (3812352), Guerneville (3812258)

Threat List Data from the CNDDB


Threat List Total:	6
EOs with Threat Listed:	Total EOs	% of EOs
	4	67 %
Grazing	4	66%
Feral pigs	3	50%
Non-native plant impacts	3	50%
Other	2	33%
Foot traffic/trampling	2	33%
Mining	1	16%

Notes



Known only from The Cedars and along Porter Creek.
Threats:
Possibly threatened by grazing and non-native plants.
Taxonomy:
Similar to E. angustatus. See Phytologia 72(3):157-208 (1992) for original description.

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 29 October 2025].