CNPS

CNPS Rare Plant Inventory



Taxon Details

Ivesia paniculata

Ash Creek ivesia

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Photo of Ivesia paniculata
© 2007 F. Gauna 		Photo of Ivesia paniculata
© 2007 F. Gauna 		Photo of Ivesia paniculata
© 2007 F. Gauna

Taxon Summary:

Ivesia paniculata, commonly known as Ash Creek ivesia, is a perennial herb in the Rosaceae that is found only in California. It occurs within Great Basin scrub, Pinyon and juniper woodland, and Upper montane coniferous forest, growing at elevations from 1500 to 1950 meters. Ivesia paniculata is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification

Scientific Name:
Ivesia paniculata T.W. Nelson & J.P. Nelson
Common Name:
Ash Creek ivesia
Family: Rosaceae
Element Code: PDROS0X0S0
USDA Plants Symbol: IVPA
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: G2
State Rank:
 S2
Other Status: BLM_S; SB_UCSC; USFS_S
CRPR Changes:
Add Date: 1980-01-01
Date Edited: 2022-12-06

  Ecology and Life History

Lifeform: perennial herb
Blooming Period: May-Aug
JFMAMJJASOND
Elevation:
1500 - 1950 meters
4920 - 6400 feet
General Habitats:
  • Great Basin scrub
  • Pinyon and juniper woodland
  • Upper montane coniferous forest
Microhabitat Details:
Microhabitat:
  • Gravelly (sometimes)
  • Rocky (sometimes)
  • Volcanic

  Notes

Notes:
Known only from the Ash Valley region. Protected in part at Ash Valley RNA (BLM).
Threats:

Threatened by road maintenance, logging, trampling, and grazing.
Taxonomy:

Previously included as I. corymbosa, a name that was never validly published.

  Threat List Data from the CNDDB

Threat List Total: 7
Total EOs % of EOs
EOs with Threat Listed: 22 85 %
THREAT LIST:
Grazing 18 69%
Road/trail construction/maint. 8 30%
Logging 5 19%
Foot traffic/trampling 5 19%
ORV activity 4 15%

  Occurrence Data from the CNDDB

Total Occurrences: 26
Element Occurrence Ranks:
A B C D X U
6 12 0 0 1 7
Occurrence Status:
Historical >20 Years 21
Recent <=20 Years 5
Presence:
Presumed Extant 25
Possibly Extirpated 1
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Lassen (LAS), Modoc (MOD)
Quads: Name (Quad Code)
Ambrose Valley (4112027), Ash Valley (4112016), Lane Reservoir (4112017), Letterbox Hill (4112018), Said Valley (4012087), Whitinger Mtn. (4012086)
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

Original Description: Brittonia 33(2):165-167 (1981)
Species Account: Ivesia paniculata profile for potential Species of Conservation Concern evaluation (2018)
Other: USFS Potential Species of Conservation Concern Profile
Other: Fremontia 16(1):15-17 (1988) [BLM management plans]

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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 January 2025].
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