CNPS

CNPS Rare Plant Inventory

Species Details

Epilobium rigidum

Siskiyou Mountains willowherb

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Photo of Epilobium rigidum
© 2021 Scot Loring 		Photo of Epilobium rigidum
© 2021 Scot Loring 		Photo of Epilobium rigidum
© 2003 Norman Jensen

  Classification

Scientific Name:
Epilobium rigidum Hausskn.
Common Name:
Siskiyou Mountains willowherb
Family: Onagraceae
Element Code: PDONA060V0
USDA Plants Symbol: EPRI
Synonyms/Other Names:

  Conservation Status

CA Rare Plant Rank: 4.3
Fed List: None
State List: None
Global Rank: G3G4
State Rank:
 S3
Other Status: SB_UCSC
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2022-12-06

  Ecology and Life History

Lifeform: perennial herb
Blooming Period: Jul-Aug
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Elevation:
150 - 1200 meters
490 - 3935 feet
General Habitats:
  • Lower montane coniferous forest (serpentinite)
Microhabitat Details:
Microhabitat:

  Notes

Notes:
On watch list in OR.
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)
Del Norte (DNT), Humboldt (HUM), Siskiyou (SIS)
Quads: Name (Quad Code)
Gasquet (4112378), High Divide (4112481), High Plateau Mtn. (4112388), Hiouchi (4112471), Preston Peak (4112375), Salyer (4012385), Shelly Creek Ridge (4112387), Ship Mountain (4112367)
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

Other: USFS Potential Species of Conservation Concern Profile
Suggested Citation:
California Native Plant Society, Rare Plant Program. 2023. Rare Plant Inventory (online edition, v9.5). Website https://www.rareplants.cnps.org [accessed 1 December 2023].