Species Details

Ivesia webberi

Webber's ivesia

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Photo of Ivesia webberi
© 2007 Steve Matson
Photo of Ivesia webberi
© 2007 Steve Matson
Photo of Ivesia webberi
© 2007 Steve Matson
CA Rare Plant Rank: 1B.1
Fed List: FT (2014-07-03)
State List: None
Global Rank: G2
State Rank:
S1
Other Status: SB_CalBG/RSABG; USFS_S
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2023-05-02
Lifeform: perennial herb
Blooming Period: May-Jul
JFMAMJJASOND
Elevation:
1000 - 2075 meters
3280 - 6810 feet
General Habitats:
  • Great Basin scrub (volcanic ash)
  • Lower montane coniferous forest
  • Pinyon and juniper woodland
Microhabitat Details:
Microhabitat:
  • Gravelly (sometimes)
  • Sandy (sometimes)
Notes:
Known in CA only from Sierra and Dog valleys. Threatened by vehicles, and potentially by development, grazing, alteration of fire regimes, and non-native plants. Threatened in NV. See Proceedings of the American Academy of Arts and Sciences 10:71 (1874) for original description.
Threats:
Taxonomy:
Threat List Total: 12
Total EOs % of EOs
EOs with Threat Listed: 12 92 %
THREAT LIST:
Non-native plant impacts 7 53%
ORV activity 7 53%
Grazing 7 53%
Improper burning regime 3 23%
Road/trail construction/maint. 3 23%
Total Occurrences: 13
Element Occurrence Ranks:
A B C D X U
2 4 2 1 2 2
Occurrence Status:
Historical >20 Years 4
Recent <=20 Years 9
Presence:
Presumed Extant 11
Possibly Extirpated 1
Presumed Extirpated 1
California Endemic:
California Island:
States: Name (Code)
California (CA), Nevada (NV)
California Counties and Islands: Name (Code)
Lassen (LAS), Plumas (PLU), Sierra (SIE)
Quads: Name (Quad Code)
Chilcoot (3912072), Constantia (3912081), Crescent Mills (4012018), Dog Valley (3912051), Evans Canyon (3912061), Little Mud Flat (4012042), Meadow Valley (3912181), Quincy (3912088)*, Spring Garden (3912087), Taylorsville (4012017)
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.
Presumed Extant
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