Taxon Report
Rhamnus alnifolia L'Heralder buckthorn |
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Taxon Summary
Rhamnus alnifolia, commonly known as alder buckthorn, is a perennial deciduous shrub in the Rhamnaceae that is found in California and elsewhere. It occurs within Lower montane coniferous forest, Meadows and seeps, Riparian scrub, and Upper montane coniferous forest, growing at elevations from 1370 to 2130 meters. Rhamnus alnifolia is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Rhamnus alnifolia L'Her |
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Common Name: |
alder buckthorn |
| Family: | Rhamnaceae |
| Element Code: | PDRHA0C010 |
| USDA Plants Symbol: | RHAL |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial deciduous shrub |
| Blooming Period: May-Jul | May-Jul |
| Elevation: | 1370-2130 (4495-6990) |
| General Habitats: | Lower montane coniferous forest, Meadows and seeps, Riparian scrub, Upper montane coniferous forest |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 2B.2 |
| Global Rank: | G5 |
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State Rank: |
S3 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_UCSC |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 27 |
| Element Occurrence Ranks: | |
| Excellent (A) | 3 |
| Good (B) | 4 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 1 |
| Unknown (U) | 19 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Butte (BUT), Lassen (LAS), Nevada (NEV), Placer (PLA), Plumas (PLU), Sierra (SIE) | |
| Quads: Name (Quad Code) | |
| Antelope Lake (4012025), Bucks Lake (3912182), Canyondam (4012121), Caribou (4012112), Cisco Grove (3912035), Gold Lake (3912066), Hobart Mills (3912042), Independence Lake (3912043), Janesville (4012035), Martis Peak (3912031), Mt. Fillmore (3912067), Norden (3912033), Soapstone Hill (3912173), Soda Springs (3912034), Spring Garden (3912087), Tahoe City (3912022), Taylorsville (4012017), Truckee (3912032), Westwood West (4012131) | |
Threat List Data from the CNDDB
| Threat List Total: | 5 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 8 | 30 % | |
| Logging | 4 | 14% |
| Road/trail construction/maint. | 1 | 3% |
| Dam/Inundation | 1 | 3% |
| Development | 1 | 3% |
| Grazing | 1 | 3% |
Selected References
| CRPR List Addition on 2008-03-26 |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 January 2025].