Taxon Report

Erigeron petrophilus Greene var. viscidulus (Gray) G. Nesom

Klamath rock daisy

Print Report

Taxon Summary

Erigeron petrophilus var. viscidulus, commonly known as Klamath rock daisy, is a perennial rhizomatous herb in the Asteraceae that is found in California and elsewhere. It occurs within Chaparral, Lower montane coniferous forest, Meadows and seeps, and Upper montane coniferous forest, growing at elevations from 1500 to 2700 meters. Erigeron petrophilus var. viscidulus is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Erigeron petrophilus Greene var. viscidulus (Gray) G. Nesom
Common Name:	Klamath rock daisy
Family:	Asteraceae
Element Code:	PDAST3M352
USDA Plants Symbol:	ERPEV
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Jul-Sep	Jul-Sep
Elevation:	1500-2700 (4920-8860)
General Habitats:	Chaparral, Lower montane coniferous forest, Meadows and seeps, Upper montane coniferous forest
Microhabitat:	Serpentine (sometimes)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G4T4
State Rank:	S4
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: False
California Counties and Islands: Name (Code)
Mendocino (MEN), Shasta (SHA), Siskiyou (SIS), Trinity (TRI)
Quads: Name (Quad Code)
Boulder Peak (4112351), Caribou Lake (4112218), Carrville (4112216), Cecil Lake (4112312), China Mtn. (4112245), Condrey Mtn. (4112288), Covington Mill (4012287), Dees Peak (4112313), Dunsmuir (4112223), Dutch Creek (4112381), Eaton Peak (4112238), Four Corners Rock (4012312), Kangaroo Mtn. (4112382), Leech Lake Mtn. (3912381), Long Ridge (4012313), Mount Eddy (4112234), Mt. Hilton (4012381), Mumbo Basin (4112225), Rush Creek Lakes (4012278), Scott Bar (4112361), Scott Mountain (4112236), Seven Lakes Basin (4112224), Siligo Peak (4012288), South China Mtn. (4112235), Swim Ridge (4012322), Thompson Peak (4112311), Thurston Peaks (4012382), Ukonom Lake (4112353), Ycatapom Peak (4112217)

Threat List Data from the CNDDB


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

Notes



Intergrades with E. reductus. E. petrophilus Endangered in OR. See Synoptical Flora of North America 1(2):215 (1884) for original description, and Phytologia 72(3):157-208 (1992) for taxonomic treatment.
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 27 June 2025].