Taxon Report

Erigeron inornatus Gray var. calidipetris G. Nesom

hot rock daisy

Print Report

Taxon Summary

Erigeron inornatus var. calidipetris, commonly known as hot rock daisy, is a perennial herb in the Asteraceae that is found only in California. It occurs within Lower montane coniferous forest (sandy, and volcanic), growing at elevations from 1100 to 1935 meters. Erigeron inornatus var. calidipetris is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Erigeron inornatus Gray var. calidipetris G. Nesom
Common Name:	hot rock daisy
Family:	Asteraceae
Element Code:	PDAST3M1Z1
USDA Plants Symbol:	ERINC3
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Sep	Jun-Sep
Elevation:	1100-1935 (3610-6350)
General Habitats:	Lower montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G5T3
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: True
California Counties and Islands: Name (Code)
Butte (BUT), Lassen (LAS), Plumas (PLU), Shasta (SHA), Siskiyou (SIS), Tehama (TEH)
Quads: Name (Quad Code)
Bartle (4112137), Bogard Buttes (4012152), Border Mtn. (4112144), Butte Meadows (4012115), Chalk Mtn. (4012187), Chester (4012132), Childs Meadows (4012134), Elk Spring (4112231), Grizzly Peak (4112128), Harvey Mtn. (4012161), Horse Peak (4112147), Humbug Valley (4012123), Indian Spring Mtn. (4112135), Jacks Backbone (4012166), Jonesville (4012114), Kinyon (4112138), Lake McCloud (4112221), Manzanita Lake (4012155), Mt. Harkness (4012143), Onion Butte (4012125), Pegleg Mtn. (4012048), Pine Creek Valley (4012151), Porcupine Butte (4112145), Rainbow Mtn. (4112148), Stover Mtn. (4012133), Swain Mountain (4012141), Thousand Lakes Valley (4012165), Viola (4012156), Westwood East (4012038), Westwood West (4012131), Whitehorse (4112134)

Threat List Data from the CNDDB


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

Notes



Possibly threatened by vehicles and logging. See Phytologia 72(3):157-208 (1992) for original description.
Threats:

Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile

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].