Taxon Report
Allium marvinii A. Davids.Yucaipa onion |
 © 2013 Keir Morse |
Species Description:
Allium marvinii, commonly known as Yucaipa onion, is a perennial bulbiferous herb in the Alliaceae that is found only in California. It occurs within Chaparral (clay, and openings), growing at elevations from 760 to 1065 meters. Allium marvinii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.
Classification
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Scientific Name: |
Allium marvinii A. Davids. |
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Common Name: |
Yucaipa onion |
| Family: | Alliaceae |
| Element Code: | PMLIL02330 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial bulbiferous herb |
| Blooming Period: Apr-May | Apr-May |
| Elevation: | 760-1065 (2495-3495) |
| General Habitats: | Chaparral |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_CalBG/RSABG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 47 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 3 |
| Fair (C) | 1 |
| Poor (D) | 0 |
| None (X) | 1 |
| Unknown (U) | 42 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Orange (ORA), Riverside (RIV), San Bernardino (SBD), San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Alberhill (3311764), Barrett Lake (3211666), Beaumont (3311688), Beauty Mountain (3311646), Black Star Canyon (3311776), Blackburn Canyon (3311667), Bonsall (3311732), Cameron Corners (3211664), Cuyamaca Peak (3211685), Descanso (3211675), El Cajon Mtn. (3211687), El Casco (3311781), Forest Falls (3411618), Hot Springs Mtn. (3311635), Idyllwild (3311666), Lake Mathews (3311774), Mesa Grande (3311627), Morena Reservoir (3211665), Mount Laguna (3211674), Pechanga (3311741), Rodriquez Mtn. (3311628), Sage (3311658), San Jacinto (3311678), Santa Ysabel (3311616), Sitton Peak (3311754), Viejas Mountain (3211676), Warner Springs (3311636), Wildomar (3311753) | |
Threat List Data from the CNDDB
| Threat List Total: | 7 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 11 | 23 % | |
| Other | 5 | 10% |
| Non-native plant impacts | 4 | 8% |
| Road/trail construction/maint. | 3 | 6% |
| Development | 3 | 6% |
| Grazing | 1 | 2% |
| Altered flood/tidal/hydrologic regime | 1 | 2% |
| Biocides | 1 | 2% |
Notes
| Known only from the Yucaipa and Beaumont area of the southern San Bernardino Mtns. Threatened by non-native plants, urbanization and alteration of fire regimes. Not in TJM (1993). See Bulletin of the Southern California Academy of Sciences 20:49 (1921) for original description. |
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Threats: |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 15 January 2025].