CNPS

CNPS Rare Plant Inventory



Taxon Details

Erigeron petrophilus var. viscidulus

Klamath rock daisy

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Photo of Erigeron petrophilus var. viscidulus
©2014 Neal Kramer 		Photo of Erigeron petrophilus var. viscidulus
©2014 Steve Matson 		Photo of Erigeron petrophilus var. viscidulus
©2014 Steve Matson

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:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 4.3
Fed List: None
State List: None
Global Rank: G4T4
State Rank:
 S4
Other Status:
CRPR Changes:
Add Date: 1994-01-01
Date Edited: 2021-12-09

  Ecology and Life History

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

  Notes

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:

  Threat List Data from the CNDDB

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

  Occurrence Data from the CNDDB

Total Occurrences: 0
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 0
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 0
Presence:
Presumed Extant 0
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA), Oregon (OR)
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)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

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Suggested Citation:
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 26 June 2025].
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