Taxon Report
Eriogonum evanidum Revealvanishing wild buckwheat |
 © 2008 Naomi Fraga |
Taxon Summary
Eriogonum evanidum, commonly known as vanishing wild buckwheat, is a annual herb in the Polygonaceae that is found in California and elsewhere. It occurs within Chaparral, Cismontane woodland, Lower montane coniferous forest, and Pinyon and juniper woodland, growing at elevations from 1100 to 2225 meters. Eriogonum evanidum is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Eriogonum evanidum Reveal |
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Common Name: |
vanishing wild buckwheat |
| Family: | Polygonaceae |
| Element Code: | PDPGN08780 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Jul-Oct | Jul-Oct |
| Elevation: | 1100-2225 (3610-7300) |
| General Habitats: | Chaparral, Cismontane woodland, 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: | G1 |
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State Rank: |
S1S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 9 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 3 |
| Fair (C) | 2 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 4 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Riverside (RIV), San Bernardino (SBD), San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Alpine (3211677), Anza (3311656), Big Bear City (3411637), Butterfly Peak (3311655), Descanso (3211675), Fawnskin (3411638), Hot Springs Mtn. (3311635), Idyllwild (3311666), Moonridge (3411627), Viejas Mountain (3211676), Warner Springs (3311636) | |
Threat List Data from the CNDDB
| Threat List Total: | 7 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 5 | 56 % | |
| ORV activity | 3 | 33% |
| Recreational use (non-ORV) | 3 | 33% |
| Foot traffic/trampling | 2 | 22% |
| Grazing | 2 | 22% |
| Logging | 1 | 11% |
| Road/trail construction/maint. | 1 | 11% |
| Development | 1 | 11% |
Notes
| See E. foliosum in The Jepson Manual (1993) and see Madroño 59(3):150-155 (2012) for information on rediscovery. |
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Threats: |
| Threatened by development, foot traffic, grazing, recreational activities, and vehicles. Possibly threatened by alteration of fire regimes and non-native plants. |
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Taxonomy: |
| Easily confused with E. davidsonii; possibly overlooked. See Phytologia 86(3): 133 (2004) for original description. |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 28 October 2025].