CNPS

CNPS Rare Plant Inventory



Taxon Details

Erigeron maniopotamicus

Mad River fleabane daisy

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Photo of Erigeron maniopotamicus
©2018 John Doyen 		Photo of Erigeron maniopotamicus
©2018 John Doyen 		Photo of Erigeron maniopotamicus
©2007 Dean Wm. Taylor, Ph.D.

Taxon Summary:

Erigeron maniopotamicus, commonly known as Mad River fleabane daisy, is a perennial herb in the Asteraceae that is found only in California. It occurs within Lower montane coniferous forest, Meadows and seeps (openings, and dry), growing at elevations from 1275 to 1500 meters. Erigeron maniopotamicus is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification

Scientific Name:
Erigeron maniopotamicus G.L. Nesom & T.W. Nelson
Common Name:
Mad River fleabane daisy
Family: Asteraceae
Element Code: PDASTE1050
USDA Plants Symbol: ERMA19
Synonyms/Other Names:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G1G2
State Rank:
 S1S2
Other Status: BLM_S; SB_UCSC; USFS_S
CRPR Changes:
added to 1B on 2005-02-10
Add Date: 2005-01-01
Date Edited: 2025-03-05

  Ecology and Life History

Lifeform: perennial herb
Blooming Period: May-Aug
JFMAMJJASOND
Elevation:
1275 - 1500 meters
4185 - 4920 feet
General Habitats:
  • Lower montane coniferous forest
  • Meadows and seeps (openings, dry)
Microhabitat Details:
Microhabitat:
  • Disturbed areas
  • Openings
  • Roadsides
  • Rocky

  Notes

Notes:
Known from widely disjunct locations in east-central HUM Co. and adjacent TRI Co. Potentially threatened by road maintenance, road construction, grazing, and logging. Not in TJM (1993). See SIDA 21(2): 673 (2004) for original description.
Threats:
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 5
Total EOs % of EOs
EOs with Threat Listed: 9 90 %
THREAT LIST:
Road/trail construction/maint. 6 60%
Logging 5 50%
Grazing 2 20%
ORV activity 1 10%
Other 1 10%

  Occurrence Data from the CNDDB

Total Occurrences: 10
Element Occurrence Ranks:
A B C D X U
0 3 1 0 0 6
Occurrence Status:
Historical >20 Years 3
Recent <=20 Years 7
Presence:
Presumed Extant 10
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Humboldt (HUM), Trinity (TRI)
Quads: Name (Quad Code)
Board Camp Mtn. (4012366), Dinsmore (4012345), Lake Mountain (4012314), Zenia (4012324)
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

CNPS Status Review: CRPR List Addition on 2005-02-10
Other: USFS Potential Species of Conservation Concern Profile

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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 2 July 2025].
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