CNPS

CNPS Rare Plant Inventory

Species Details

Eriodictyon altissimum

Indian Knob mountainbalm

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  Classification

Scientific Name:
Eriodictyon altissimum Wells
Common Name:
Indian Knob mountainbalm
Family: Namaceae
Element Code: PDHYD04010
USDA Plants Symbol: ERAL12
Synonyms/Other Names:

  Conservation Status

CA Rare Plant Rank: 1B.1
Fed List: FE (1994-12-15)
State List: CE (1979-07-01)
Global Rank: G1
State Rank:
 S1
Other Status: SB_CalBG/RSABG; SB_USDA
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2024-06-04

  Ecology and Life History

Lifeform: perennial evergreen shrub
Blooming Period: Mar-Jun
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Elevation:
80 - 270 meters
260 - 885 feet
General Habitats:
  • Chaparral (maritime)
  • Cismontane woodland
  • Coastal scrub
Microhabitat Details:
Microhabitat:
  • Sandstone

  Notes

Notes:
Known only from the Irish Hills and Indian Knob. Threatened by urbanization, energy development, and vehicles. Possibly threatened by alteration of fire regimes and non-native plants. See Madroño 16(6):184-186 (1962) for original description.
Threats:
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 8
Total EOs % of EOs
EOs with Threat Listed: 5 83 %
THREAT LIST:
Other 2 33%
Recreational use (non-ORV) 2 33%
Road/trail construction/maint. 1 16%
Wood cutting or brush clearing 1 16%
Development 1 16%

  Occurrence Data from the CNDDB

Total Occurrences: 6
Element Occurrence Ranks:
A B C D X U
1 1 2 0 1 1
Occurrence Status:
Historical >20 Years 1
Recent <=20 Years 5
Presence:
Presumed Extant 5
Possibly Extirpated 1
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
San Luis Obispo (SLO)
Quads: Name (Quad Code)
Morro Bay South (3512037), Pismo Beach (3512026)
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

Suggested Citation:
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5). Website https://www.rareplants.cnps.org [accessed 14 November 2024].