Taxon Report
Ivesia webberi GrayWebber's ivesia |
 © 2007 Steve Matson |
Classification
|
Scientific Name: |
Ivesia webberi Gray |
|
Common Name: |
Webber's ivesia |
| Family: | Rosaceae |
| Element Code: | PDROS0X0Q0 |
| USDA Plants Symbol: | IVWE |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: May-Jul | May-Jul |
| Elevation: | 1000-2075 (3280-6810) |
| General Habitats: | Great Basin scrub, Lower montane coniferous forest, Pinyon and juniper woodland |
| Microhabitat: | Gravelly (sometimes), Sandy (sometimes) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G2 |
|
State Rank: |
S1 |
| State List: | None |
| Fed List: | FT |
| Other Status: | SB_CalBG/RSABG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 13 |
| Element Occurrence Ranks: | |
| Excellent (A) | 2 |
| Good (B) | 4 |
| Fair (C) | 2 |
| Poor (D) | 1 |
| None (X) | 2 |
| Unknown (U) | 2 |
| California Endemic: False | |
| 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) | |
Threat List Data from the CNDDB
| Threat List Total: | 12 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 12 | 92 % | |
| Non-native plant impacts | 7 | 53% |
| ORV activity | 7 | 53% |
| Grazing | 7 | 53% |
| Improper burning regime | 3 | 23% |
| Road/trail construction/maint. | 3 | 23% |
| Other | 3 | 23% |
| Development | 3 | 23% |
| Foot traffic/trampling | 2 | 15% |
| Agriculture | 1 | 7% |
| Dam/Inundation | 1 | 7% |
| Recreational use (non-ORV) | 1 | 7% |
| Logging | 1 | 7% |
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. |
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Threats: |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 26 December 2024].