Taxon Report

Erigeron uncialis Blake var. uncialis

limestone daisy

Print Report

Taxon Summary

Erigeron uncialis var. uncialis, commonly known as limestone daisy, is a perennial herb in the Asteraceae that is found in California and elsewhere. It occurs within Great Basin scrub, Pinyon and juniper woodland, and Subalpine coniferous forest, growing at elevations from 1900 to 2900 meters. Erigeron uncialis var. uncialis is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Erigeron uncialis Blake var. uncialis
Common Name:	limestone daisy
Family:	Asteraceae
Element Code:	PDASTE1081
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jul	May-Jul
Elevation:	1900-2900 (6235-9515)
General Habitats:	Great Basin scrub, Pinyon and juniper woodland, Subalpine coniferous forest
Microhabitat:	Carbonate
Microhabitat Details:	Crevices of limestone cliffs.

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G4T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; USFS_S
CRPR Changes:	changed from 2.2 to 1B.2 on 2006-10-11

Occurrence Data from the CNDDB


Total Occurrences:	8
Element Occurrence Ranks:
Excellent (A)	3
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	5

Location


California Endemic: False
California Counties and Islands: Name (Code)
Inyo (INY), San Bernardino (SBD)
Quads: Name (Quad Code)
Cerro Gordo Peak (3611757), Clark Mtn. (3511555), Crooked Creek (3711841), Mazourka Peak (3611881), Telescope Peak (3611721), Tin Mountain (3611784)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	13 %
Mining	1	12%

Notes



Known from fewer than 10 occurrences in Inyo and San Bernardino Counties. Possibly threatened by mining. See SIDA 21(1):19-39 (2004) for revised nomenclature.
Threats:

Taxonomy:

Selected References

CRPR List Change on 2006-10-11

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 24 October 2025].