Taxon Report
Allium yosemitense Eastw.Yosemite onion |
 © 2012 Lynn Robertson |
Taxon Summary
Allium yosemitense, commonly known as Yosemite onion, is a perennial bulbiferous herb in the Alliaceae that is found only in California. It occurs within Broadleafed upland forest, Chaparral, Cismontane woodland, and Lower montane coniferous forest, growing at elevations from 535 to 2200 meters. Allium yosemitense is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.Classification
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Scientific Name: |
Allium yosemitense Eastw. |
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Common Name: |
Yosemite onion |
| Family: | Alliaceae |
| Element Code: | PMLIL022L0 |
| USDA Plants Symbol: | ALYO |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial bulbiferous herb |
| Blooming Period: Apr-Jul | Apr-Jul |
| Elevation: | 535-2200 (1755-7220) |
| General Habitats: | Broadleafed upland forest, Chaparral, Cismontane woodland, Lower montane coniferous forest |
| Microhabitat: | Granitic (sometimes), Metamorphic (sometimes), Rocky |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.3 |
| Global Rank: | G3 |
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State Rank: |
S3 |
| State List: | CR |
| Fed List: | None |
| Other Status: | SB_UCSC; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 14 |
| Element Occurrence Ranks: | |
| Excellent (A) | 4 |
| Good (B) | 1 |
| Fair (C) | 0 |
| Poor (D) | 1 |
| None (X) | 0 |
| Unknown (U) | 8 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Mariposa (MPA), Tuolumne (TUO) | |
| Quads: Name (Quad Code) | |
| Ascension Mtn. (3711978), Buckingham Mtn. (3711957), El Capitan (3711966), El Portal (3711967), Wawona (3711956) | |
Threat List Data from the CNDDB
| Threat List Total: | 5 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 4 | 29 % | |
| Erosion/runoff | 1 | 7% |
| Mining | 1 | 7% |
| Other | 1 | 7% |
| Recreational use (non-ORV) | 1 | 7% |
| Road/trail construction/maint. | 1 | 7% |
Notes
| Known from fewer than twenty occurrences. |
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Threats: |
| Possibly threatened by recreational activities. |
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Taxonomy: |
| See Leaflets of Western Botany 1:132-133 (1934) for original description, Fremontia 8(1):15-18 (1980) for information on rediscovery, and Aliso 11(1):27-35 (1985) for taxonomic treatment. |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 17 March 2025].